The Stage Lighting Fixture Tables

10 07 2009

The STAGE LIGHTING FIXTURE TABLES – contain photometric data for over 125 common stage lighting spotlights, all arranged alphabetically by manufacturer. This information is intended to help the lighting designer, architect, engineer or educator – in luminaire specification and comparisons.

This edition contains common ELLIPSOIDAL, FRESNEL and PAR spotlight fixtures – (with 120 volt lamps). The following information is as published by each manufacturer.

   ----------------------------------------------------------------------
                              TABLE OF CONTENTS
   ----------------------------------------------------------------------
   1.a      ALTMAN        - Fixed Ellipsoidals                   TABLE 1a
   1.b      ALTMAN        - Zoom Ellipsoidals                    TABLE 1b
   1.c      ALTMAN        - Fresnels                             TABLE 1c
   ----------------------------------------------------------------------
   2.a      COLORTRAN     - Fixed Ellipsoidals                   TABLE 2a
   2.b      COLORTRAN     - Zoom Ellipsoidals                    TABLE 2b
   2.c      COLORTRAN     - Fresnels                             TABLE 2c
   ----------------------------------------------------------------------
   3.a      E.T.C.        - Source 4 Ellipsoidals                TABLE 3a
   3.b      E.T.C.        - Source 4 Pars                        TABLE 3b
   ----------------------------------------------------------------------
   4.a      STRAND        - Fixed Ellipsoidals                   TABLE 4a
   4.b      STRAND        - Zoom Ellipsoidals                    TABLE 4b
   4.c      STRAND        - Fresnels                             TABLE 4c
   ----------------------------------------------------------------------
   5.a      PAR64's       - Sealed Beam Lamps                    TABLE 5a
   ----------------------------------------------------------------------
   101      Beam Spread   - calculations                              101
   102      Beam Spread   - tables                                    102
   103      Illuminance   - calculations                              103
   104      Illuminance   - tables                                    104
   ----------------------------------------------------------------------

======================================================================
ALTMAN - Fixed ellipsoidals                                   TABLE 1a
======================================================================
Model           Description   Field  Beam   Candela     Lamp      Lbs.
======================================================================
ALTMAN 3.5Q5    3.5" lens       48    20     12,000   EHD - 500    9.0
ALTMAN 3.5Q6    3.5"            38    24     15,000   EHD - 500    9.0
ALTMAN 3.5Q8    3.5"            28    18.5   16,000   EHD - 500    9.0
ALTMAN 3.5Q10   3.5"            23    17     17,300   EHD - 500    9.0
ALTMAN 3.5Q12   3.5"            18    12     20,000   EHD - 500    9.0
----------------------------------------------------------------------
ALTMAN 360Q     4.5x6.5         55    22     52,425   HP600       13.5
ALTMAN 360Q     6x9             37    16     83,700   HP600       14.0
ALTMAN 360Q     6x12            26    11    164,925   HP600       15.0
ALTMAN 360Q     6x16            19     8.5  231,750   HP600       15.0
ALTMAN 360Q     6x22            11     8    238,500   HP600       15.0
----------------------------------------------------------------------
ALTMAN 360Q     4.5x6.5         55    22     51,000   EHF - 750.  13.5
ALTMAN 360Q     6x9             37    16     88,000   EHF - 750.  14.0
ALTMAN 360Q     6x12            26    11    154,000   EHF - 750.  15.0
ALTMAN 360Q     6x16            19     8.5  188,000   EHF - 750.  15.0
ALTMAN 360Q     6x22            11     8    219,000   EHF - 750.  15.0
----------------------------------------------------------------------
ALTMAN 1KL6-50  50 degree       50    31     33,000   FEL - 1KW.  24.0
ALTMAN 1KL6-40  40 degree       40    27     54,500   FEL - 1KW.  25.0
ALTMAN 1KL6-30  30 degree       30    20     86,000   FEL - 1KW.  24.0
ALTMAN 1KL6-20  20 degree       20    11.5  161,000   FEL - 1KW.  25.0
ALTMAN 1KL6-12  12 degree #     12    12    180,000   FEL - 1KW   24.0
ALTMAN 1KL8-10  10 degree #     12    12    180,000   FEL - 1KW      -
ALTMAN 1KL10-5   5 degree        6.9   5    378,000   FEL - 1KW.     -
----------------------------------------------------------------------
ALTMAN S650     50 Shakespeare  50    23     46,300   HP600/115.  15.0
ALTMAN S640     40 Shakespeare  38    20     98,100   HP600/115.  15.0
ALTMAN S630     30 Shakespeare  28    13    149,200   HP600/115.  15.0
ALTMAN S620     20 Shakespeare  20    13    189,700   HP600/115.  15.0
ALTMAN S612     12 Shakespeare  12     7    327,700   HP600/115.  21.0
ALTMAN S610     10 Shakespeare  10     7    791,000   HP600/115.  16.0
ALTMAN S65       5 Shakespeare   7     5    974,900   HP600/115.  16.0
----------------------------------------------------------------------
* All data provided by Altman Stage Lighting website, 1999.
* 3.5 Series - set for cosine distribution with EHD 500 watt. 
* 360 Series - set for cosine distribution (most have 'hot' center).
* 360 Series - Date is shown for both the EHF (750 watts 300 hours)
  and  the new more efficient HP600 (600 watt 300 hours) lamps.
* 1KL Series - set to 'flat field' distribution. (FEL-1000w 300 hours)
* Shakespeare Series - 'flat field' distribution. (FLX-HX600/115V)
# Theses two fixtures have the same photometrics when set for cosine
  distribution, however the 10 degree is capable of 490,875 VS 343,000 
  candela, when adjusted for 'peak center'.
----------------------------------------------------------------------

======================================================================
ALTMAN - Zoom ellipsoidals                                    TABLE 1b
======================================================================
Model           Description   Field  Beam   Candela     Lamp      Lbs.
======================================================================
ALTMAN Baby Zm  4.5"     N:     25    22     44,800   EHF - 750      -
#4.5-2550Z               W:     50    25     27,000
----------------------------------------------------------------------
ALTMAN Q2040    6"       N:     19     -     90,000   FEL - 1KW      -
circa 1980               W:     40     -     34,800
----------------------------------------------------------------------
ALTMAN 1KL6     20-40    N:     20    14     92,000   FEL - 1KW      -
                         W:     40    31     40,000
----------------------------------------------------------------------
ALTMAN 1KL8     14-24    N:     14     8    490,000   FEL - 1KW   34.0
peak center              W:     24    14    262,000
------------|---------------------------------------------------------
ALTMAN 1KL8     14-24    N:     14    14    173,000   FEL - 1KW   34.0
flat field               W:     24    24     64,000
----------------------------------------------------------------------
ALTMAN S61535Z  15-35    N:     15     9    351,000   HP600/115.  21.0
(Shakespeare Series)     W:     35    15    190,000                   
----------------------------------------------------------------------
ALTMAN S63055Z  30-55    N:     30    13    166,000   HP600/115.  22.0
(Shakespeare Series)     W:     55    15     66,000       
----------------------------------------------------------------------
* Note that the data for the Shakespeare zooms shows a particularly
 'hot' center. We believe that central light output will be lower if 
the fixture is adjusted for cosine distribution.
----------------------------------------------------------------------

======================================================================
ALTMAN - Fresnels                                             TABLE 1c
======================================================================
Model           Description   Field  Beam   Candela     Lamp      Lbs.
======================================================================
ALTMAN  100     3" fres  spot:  23.5  10.0    6,125   ESP 150Q/CL  3.0
                         flood: 55    34.0    1,950      "            
----------------------------------------------------------------------
ALTMAN  65Q     6" fres  spot:  16     8.8   60,125   BTL - 500W.  8.0
and    165Q              flood: 70    59.0    5,720      " 
-------------------------------------------------------------|--------
ALTMAN  65Q     6" fres  spot:  16     8.8   92,500   BTN - 750W.  8.0
and    165Q              flood: 70    59.0    8,800      " 
----------------------------------------------------------------------
ALTMAN  1KAF    6" fres  spot:  12.2   6.4  179,000   BTR - 1KW.     -
                         flood: 73.8  69.2   12,000       "           
----------------------------------------------------------------------
ALTMAN  75Q     8" fres  spot:  12     6.7  170,000   BVT - 1KW.     -
and    175Q              flood: 45    37.0   20,000       "
----------------------------------------------------------------------
Altman 165Q and 175Q - are with 'screw' focus.
----------------------------------------------------------------------

======================================================================
COLORTRAN - Fixed ellipsoidals                                TABLE 2a
======================================================================
ELLIPSOIDALS:   Description   Field  Beam   Candela     Lamp      Lbs.
======================================================================
C'TRAN 213-052  40 degree       40    15.0   48,000   FEL - 1KW.  20.1
C'TRAN 213-062  30 degree       30    11.0  118,000   FEL - 1KW.  20.1
C'TRAN 213-072  20 degree       20     8.3  171,000   FEL - 1KW.  19.1
C'TRAN 213-092  12 degree       12     6.8  298,000   FEL - 1KW.  19.1
C'TRAN 213-102  10 degree       10     5.8  563,000   FEL - 1KW.  21.1
C'TRAN 213-112   5 degree        5     3.3  996,000   FEL - 1KW.  30.3
----------------------------------------------------------------------
C'TRAN 650-015  50 degree       50    33.3   28,700   FEL - 1KW.     -
C'TRAN 650-025  40 degree       40    29.0   48,000   FEL - 1KW.     -
C'TRAN 650-035  30 degree       30    20.0  118,000   FEL - 1KW.     -
C'TRAN 650-045  20 degree       20    13.4  171,000   FEL - 1KW.     -
C'TRAN 650-055  15 degree       15     8.0  298,000   FEL - 1KW.     -
C'TRAN 650-075  10 degree       10     6.7  563,000   FEL - 1KW.     -
C'TRAN 650-085   5 degree        5     3.4  938,000   FEL - 1KW.     -
----------------------------------------------------------------------
C'TRAN MINI-ELLIPSE 50 4.5"     50    22.0   19,500   BCP - 500      -
C'TRAN MINI-ELLIPSE 40 4.5"     40    22.0   31,600   BCP - 500      -
C'TRAN MINI-ELLIPSE 30 4.5"     30    11.0   58,000   BCP - 500      -
----------------------------------------------------------------------
* All fixtures are shown, adjusted for cosine illumination.
----------------------------------------------------------------------

======================================================================
COLORTRAN - Zoom ellipsoidals                                 TABLE 2b
======================================================================
ZOOMS:          Description   Field  Beam   Candela     Lamp      Lbs.
======================================================================
C'TRAN 213-305  4.5"     N:     40    26.7   32,160   FMR - 600   14.9
Zoom Mini       40-65    W:     65    43.0    8,900
----------------------------------------------------------------------
C'TRAN 213-315  4.5"     N:     25    16.7   49,000   FMR - 600   15.0
Zoom Mini       25-50    W:     50    33.3   18,275
----------------------------------------------------------------------
C'TRAN 213-325  4.5"     N:     15    10.0   61,600   FMR - 600   16.0
Zoom Mini       15-30    W:     30    20.0   44,500
----------------------------------------------------------------------
C'TRAN 213-162  15-35    N:     15     7.5  206,000   FEL - 1KW      -
Zoom-Ellipse)            W:     35    14.0   82,000
----------------------------------------------------------------------
* All fixtures are shown, adjusted for cosine illumination.
----------------------------------------------------------------------

======================================================================
COLORTRAN - Fresnels                                          TABLE 2c
======================================================================
FRESNELS:       Description   Field  Beam   Candela     Lamp      Lbs.
======================================================================
C'TRAN 213-515  6"       spot:. 12.5   6.1  175,000   BTR - 1KW.     -
                         flood: 74.6  64.5   11,200      "            
----------------------------------------------------------------------
C'TRAN 213-525  8"       spot:  15.3   8.4  358,000   BVW - 2KW.     -
                         flood: 63.5  55.7   37,500      "            
----------------------------------------------------------------------

======================================================================
ELECTRONIC THEATRE CONTROLS (ETC)                             TABLE 3a
======================================================================
SOURCE 4'S:     Description   Field  Beam   Candela     Lamp      Lbs.
======================================================================
ETC    450      50 degree       50    33     32,000   HPL575/115  14.0
ETC    436      36 degree       36    24     69,000   HPL575/115  14.0
ETC    426      26 degree       26    17    144,000   HPL575/115  14.0
ETC    419      19 degree       17    10    236,000   HPL575/115  14.0
ETC    410      10 degree       10.4   6.9  782,500   HPL575/115  15.0
ETC    405       5 degree        6.9   5.6 1094,000   HPL575/115  19.0
----------------------------------------------------------------------
ETC    450J     50 degree       48    32     25,200   HPL575/115   9.3
ETC    436J     36 degree       36    24     48,400   HPL575/115   9.3
ETC    426J     26 degree       25    18     79,200   HPL575/115   9.3
----------------------------------------------------------------------
ETC 41530       15       N:     15    10    355,000   HPL 750/115V  21
                25       M:     23    15    202,000   HPL 750/115V  
                30       W:     30    20    110,000   HPL 750/115V  
----------------------------------------------------------------------
ETC 42550       25       N:     25    17    155,000   HPL 750/115V  17
                35       M:     36    24     96,300   HPL 750/115V  
                50       W:     50    33     59,500   HPL 750/115V  
----------------------------------------------------------------------
ETC 1VF4-3060   4.5"     N:     30    25     11,000   EHF - 750      -
(discontinued)           W:     60    50      4,000
----------------------------------------------------------------------
ETC 1VF4-2550   4.5"     N:     25    22     44,800   EHF - 750      -
(discontinued)           W:     50    25     27,000
----------------------------------------------------------------------
ETC 1VF4-1530   4.5"     N:     15    13     60,000   EHF - 750      -
(discontinued)           W:     30    18     40,000
----------------------------------------------------------------------
ETC 1VF6-2040   20-40    N:     20    15     92,000   FEL - 1KW      -
(discontinued)           W:     31.5  40     40,000 
----------------------------------------------------------------------
ETC 1VF8-1424   14-24    N:     14    14    173,000   FEL - 1KW      -
(discontinued)           W:     24    24     64,000   
----------------------------------------------------------------------
* All ETC data is current as of 1999. Data is as reported by ETC.
* All fixtures are set to cosine distribution, except the 5 degree 
Source 4 fixture is adjusted slightly flatter. 
* All the above measurements using an HPL lamp, use a calibrated lamp,
(either HPL 575/115V 16,530 lumen, or HPL 750/115V 21,900 lumens).
* All fixture weights (lbs.) are without 'C'-clamp. 
----------------------------------------------------------------------

======================================================================
ELECTRONIC THEATRE CONTROLS (ETC)                             TABLE 3b
======================================================================
PARS:           Description   Field  Beam   Candela     Lamp      Lbs.
======================================================================
ETC    S4PAR   -CLEAR           14     8    356,000   HPL575/115   300
ETC    S4PAR   -VNSP            15     8    314,000   HPL575/115   300
ETC    S4PAR   -NSP             19    10    203,000   HPL575/115   300
ETC    S4PAR   -MFL           21x34  12x19  104,000   HPL575/115   300
ETC    S4PAR   -WFL           30x51  16x33   49,000   HPL575/115   300
----------------------------------------------------------------------

======================================================================
STRAND LIGHTING - Fixed ellipsoidals                          TABLE 4a
======================================================================
Model           Description   Field  Beam   Candela     Lamp    L. Lb.
======================================================================
STRAND SL50     50 degree '99   50     -     51,000   GLC - 575 20" 15
STRAND SL36     36 degree '99   36     -     87,000   GLC - 575 20" 15
STRAND SL26     26 degree '99   26     -    194,000   GLC - 575 20" 15
STRAND SL19     19 degree '99   19     -    225,000   GLC - 575 20" 15
STRAND SL10     10 degree '99   10     -    225,000   GLC - 575 27" 15
STRAND SL5       5 degree '99    5     -  2,100,000   GLC - 575 42" 18
----------------------------------------------------------------------
STRAND 2250     50 degree '92   53    24     49,000   FEL - 1KW 22" 12
STRAND 2240     40 degree '92   38    15    107,000   FEL - 1KW 22" 13
STRAND 2230     30 degree '92   30    15    122,000   FEL - 1KW 22" 13
STRAND 2220     20 degree '92   21    13    147,000   FEL - 1KW 22" 13
STRAND 2215     15 degree '92   15    12    156,000   FEL - 1KW 27" 17
----------------------------------------------------------------------
STRAND 2135     3.5" lens '77   32    25      9,900   FDA - 400 14"  8
STRAND 2125     3.5" lens '77   24    18     15,300   FDA - 400 13"  8
STRAND 2115     3.5" lens '77   20    16     18,900   FDA - 400 12"  8
----------------------------------------------------------------------
STRAND 2204     4.5x6.5 axial   65    42     27,500   FEL - 1KW.  15.5
STRAND 2209     6x9 axial '86   43    29     58,500   FEL - 1KW.  17.0
STRAND 2212 13  6x12 axial'86   31    21     91,000   FEL - 1KW.  16.0
STRAND 2216/17  6x16 axial'86   23    15    149,600   FEL - 1KW.  16.0
STRAND 2111/12  6x12 1lens'86   15    10    288,000   FEL - 1KW.  15.5
STRAND 2113/14  8x13      '86   13     9    420,000   FEL - 1KW.  17.0
STRAND 2123/24  10x23     '86    9     6    800,000   FEL - 1KW.  24.5
----------------------------------------------------------------------
STRAND PATT 23N                 11     -     34,000   500w. T1       -
STRAND PATT 23                  22     -     16,650   500w. T1       -
STRAND PATT 23F                 30     -      8,900   500w. T1       -
STRAND PATT 23W                 37     -      6,530   500w. T1       -
STRAND PATT 263                 22     -     55,800   1000. T12      -
STRAND PATT 263W                39     -     22,500   1000. T12      -
STRAND PATT 253                 22    22    260,000   2000. H/1      -
STRAND PATT 293                 15    15    445,000   2000. H/1      -
----------------------------------------------------------------------
* All STRAND data is current as of 1999. Data is as reported by STRAND.
* All fixtures are set to cosine distribution (PATT series: flat field)  
----------------------------------------------------------------------

======================================================================
STRAND LIGHTING - Zoom ellipsoidals                           TABLE 4b
======================================================================
Model           Description   Field  Beam   Candela     Lamp    L. Lb.
======================================================================
STRAND SL 23/50          N:     23     -    151,000   GLC - 575 22" 15
(1999 series)            W:     50     -     43,000       "           
----------------------------------------------------------------------
STRAND SL 15/32          N:     15     -    237,000   GLC - 575 23" 15
(1999 series)            W:     32     -    126,000       "           
----------------------------------------------------------------------
STRAND LEKOLITE 4.5"     N:     25    16    142,200   HX600-575   15.0
#11141 (old#: 2205)      W:     50    20     62,000       "           
----------------------------------------------------------------------
STRAND, QUARTET 22-40    N:     20.4  11.3   42,031   FRK - 650   10.6
#11091                   W:     30.6  12.8   24,866       "
----------------------------------------------------------------------
STRAND LEKOLITE 6"       N:     15    10    204,000   FEL - 1KW   23.7
(old 2206)               W:     40    24     50,000       "           
----------------------------------------------------------------------
STRAND, CANTATA 11/26    N:     11    10.9  248,000   FEL - 1KW   28.0
                         W:     26    13.5  134,000
----------------------------------------------------------------------
STRAND, CANTATA 18/32    N:     18    12.5  171,000   FEL - 1KW   26.5
                         W:     32    17.1   80,000
----------------------------------------------------------------------
STRAND, CANTATA 26/44    N:     26    18.0   88,000   FEL - 1KW   24.0
                         W:     44    23.4   48,000
----------------------------------------------------------------------
STRAND, OPTIQUE  8/17    N:      8     7    355,000   T29 -1200   28.0
                         W:     16    12     96,000
----------------------------------------------------------------------
STRAND, OPTIQUE 15/42    N:     15    13    110,000   T29 -1200   27.0
                         W:     37    24     24,000
----------------------------------------------------------------------
STRAND, ALTO     8/16    N:      8      .   592,000   CP92-2000   37.0
                         W:     16      .   277,671
----------------------------------------------------------------------
STRAND, ALTO    14/32    N:     14      .   360,000   CP92-2000   37.0
                         W:     32      .   123,487
----------------------------------------------------------------------
STRAND, ALTO    20/38    N:     20      .   212,000   CP92-2000   35.0
                         W:     38      .    81,130
----------------------------------------------------------------------
STRAND, TOCCATA 10/26    N:     10      .         -   CP92-2000   45.0
                         W:     26      .         -
----------------------------------------------------------------------
STRAND, TOCCATA 15/38    N:     15      .         -   CP92-2000   43.0
                         W:     38      .         -
----------------------------------------------------------------------
* All STRAND data is current as of 1999. Data is as reported by STRAND.
* All fixtures are set to cosine distribution. 
----------------------------------------------------------------------

======================================================================
STRAND LIGHTING - Fresnels                                    TABLE 4c
======================================================================
Model           Description   Field  Beam   Candela     Lamp      Lbs.
======================================================================
STRAND  3142    3"       spot:  16     8.5    5,800   250Q CL/DC   4.0
                         flood: 58    38.0    2,200      "            
----------------------------------------------------------------------
STRAND QUARTET "F"       spot:  16     9     55,099   FRK - 650    6.2
                         flood: 53    42     11,166     "
----------------------------------------------------------------------
STRAND  3380    6"       spot:  13     6    175,000   BTR - 1KW.  10.5
#12081                   flood: 65    55     18,500       "           
----------------------------------------------------------------------
STRAND  3480    8"       spot:  14     8    412,000   BVW - 2KW.  17.0
#12181                   flood: 68    62     35,000       "           
----------------------------------------------------------------------

======================================================================
PAR-64 SPOTLIGHTS                                             TABLE 5a
======================================================================
All major lighting manufacturers make PAR64 fixtures to accommodate 
the PAR64 sealed beam lamp. This is a highly efficient lamp, available
in various beam spreads. Fixtures are available with either a 'short' 
or 'long' housing, to add some control of flare and glare. Generally 
the photometrics of a PAR64 fixture is the same as the photometrics of
the lamp used. For this reason, lamps, not fixtures are listed below:

LAMP            Description   Field  Beam   Candela  Watts C.Temp Hrs.
======================================================================
Q1000PAR64/1    FFN -VNSP    10x24   6x12   400,000   1Kw. 3200K   800
----------------------------------------------------------------------
Q1000PAR64/2    FFP -NSP     14x26   7x14   330,000   1Kw. 3200K   800
----------------------------------------------------------------------
Q1000PAR64/5    FFR -MFL     21x44  12x28   125,000   1Kw. 3200K   800
----------------------------------------------------------------------
Q1000PAR64/6    FFS -WFL     45x71  24x48    40,000   1Kw. 3200K   800
----------------------------------------------------------------------
Q1000PAR64/3D   FGM -NSP     12X24   6x13   200,000   1Kw. 5200K   200
----------------------------------------------------------------------
Q1000PAR64/7D   FGN -MFL     20X43  11x27    70,000   1Kw. 5200K   200
----------------------------------------------------------------------
Q1000PAR64/NSP  PAR64-NSP    14x31   8x15   200,000   1Kw. 2950K  4000
----------------------------------------------------------------------
Q1000PAR64/MFL  PAR64-MFL    22x45  12x28    80,000   1Kw. 2950K  4000
----------------------------------------------------------------------
Q1000PAR64/WFL  PAR64-WFL    45x72  24x48    33,000   1Kw. 2950K  4000
----------------------------------------------------------------------

======================================================================
BEAM SPREAD - calculations                                         101
======================================================================

                             BEAM SPREAD 

All  tables  show  a FIELD ANGLE for each  fixture.  This  angle,  (in 
degrees) is the spread angle of the beam, where the central  intensity 
drops  to  10%.  The  field  angle  is  used  for  most  BEAM   SPREAD 
calculations, as this angle best defines the 'maximum useful' angle of 
light  from  the fixture. All beam spread calculations depend  on  the 
relationship between fixture FIELD ANGLE, DISTANCE and BEAM DIAMETER.

----------------------------------------------------------------------
1.  Calculate:  BEAM WIDTH
----------------------------------------------------------------------

To calculate the BEAM WIDTH (DIAMETER) of any fixture at any distance, 
use the following formula:                                 .       - 
                                                 Angle ---. .      |
                                                         .   .     |
    BEAM WIDTH = ANGLE x .018 x DISTANCE                .     .   Dist.
    ------------------------------------               .       .   |   
                                                      .         .  | 
    (Given: Field Angle & Distance)                  . . . . . . . _ 
                                                     |---Width---|  
Example 1: 
----------
What is the BEAM WIDTH of an ALTMAN 360Q - 6X16 at 60 feet?

Check the Fixture Tables  and determine that the ALTMAN 6x16 has a 19 
degree field angle. Now use the formula:

    WIDTH = ANGLE  x .018 x DISTANCE  
    --------------------------------
so:        19 deg. x .018 x   60'   = 20.5' wide (or diameter).
                                      ----------

----------------------------------------------------------------------
2.  Calculate:  FIELD ANGLE
----------------------------------------------------------------------

To calculate what FIELD ANGLE of fixture is needed to produce a given 
BEAM WIDTH at a given distance, use the following formula.

              BEAM WIDTH       
   ANGLE  =  ------------      (Given Beam Width & Distance)
             DIST. x .018     

Example 2: 
----------
What ANGLE of beam spread is required to produce a 12 feet wide beam, 
at a distance of 35 feet. Simply use the formula:

              BEAM WIDTH               12'
   ANGLE  =  ------------   so:  -------------- = 19 degrees.
             DIST. x .018          35' x .018          

======================================================================

======================================================================
BEAM SPREAD - tables                                               102
======================================================================

For quick calculations, use the following tables:

----------------------------------------------------------------------
BEAM WIDTH, DISTANCE, & SPREAD ANGLE                        - Imperial
---------------------------------------------------------------------- 
D.in|                         ANGLE (in degrees)
 ft.|   10    15    20    25    30    35    40    45    50    55    60  
    |------------------------------------------------------------------ 
 5  |   .9   1.4   1.8   2.3   2.7   3.2   3.6   4.1   4.5   5.0   5.4  
10  |  1.8   2.7   3.6   4.5   5.4   6.3   7.2   8.1   9.0   9.9  10.8  
15  |  2.7   4.0   5.4   6.8   8.1   9.5  10.8  12.2  13.5  14.9  16.2  
20  |  3.6   5.4   7.2   9.0  10.8  12.6  14.4  16.2  18.0  19.8  21.6  
25  |  4.5   6.8   9.0  11.3  13.5  15.8  18.0  20.3  22.5  24.6  27.0  
---------------------------------------------------------------------- 

30  |  5.4   8.1  10.8  13.5  16.2  18.9  21.6  24.3  27.0  29.7  32.4  
35  |  6.3   9.5  12.6  15.8  18.9  22.0  25.2  28.4  31.5  34.7  37.8  
40  |  7.2  10.8  14.4  18.0  21.6  25.2  28.8  32.4  36.0  39.6  43.2  
45  |  8.1  12.2  16.2  20.3  24.3  28.4  32.4  36.5  40.5  44.6  48.6  
50  |  9.0  13.5  18.0  22.5  27.0  31.5  36.0  40.5  45.0  49.5  54.0  
---------------------------------------------------------------------- 
55  |  9.9  14.6  19.8  24.8  29.7  34.7  39.6  44.6  49.5  54.5  59.4  
60  | 10.8  16.2  21.6  27.0  32.4  37.8  43.2  48.6  54.0  59.4  64.8  
65  | 11.7  17.6  23.4  29.3  35.1  41.0  46.8  52.7  58.5  64.4  70.2  
70  | 12.6  18.9  25.2  31.5  37.8  44.1  50.4  56.7  63.0  69.3  75.6  
75  | 13.5  20.3  27.0  33.8  40.5  47.3  54.0  60.8  67.6  74.3  81.0  
---------------------------------------------------------------------- 
80  | 14.4  21.6  28.8  36.0  43.2  50.4  57.6  64.8  72.0  79.2  86.4  
85  | 15.3  23.0  30.6  38.3  46.0  53.6  61.2  68.9  76.5  84.2  91.8  
90  | 16.2  24.3  32.4  40.5  48.6  56.7  64.8  72.9  81.0  89.1  97.2  
95  | 17.1  25.7  34.2  42.8  51.3  59.9  68.4  77.0  85.5  94.1 102.6  
100 | 18.0  27.0  36.0  45.0  54.0  63.0  72.0  81.0  90.0  99.0 108.0
---------------------------------------------------------------------- 

----------------------------------------------------------------------
BEAM WIDTH, DISTANCE, & SPREAD ANGLE                          - Metric
---------------------------------------------------------------------- 
D.in|                         ANGLE (in degrees)
 m. |   10    15    20    25    30    35    40    45    50    55    60 
    |----------------------------------------------------------------- 
 2  |   .36   .54   .72   .90  1.08  1.26  1.44  1.62  1.80  1.98  2.1 
 4  |   .72  1.08  1.44  1.80  2.16  2.52  2.88  3.24  3.60  3.96  4.3
 6  |  1.08  1.62  2.16  2.79  3.24  3.78  4.32  4.86  5.40  5.94  6.4
 8  |  1.44  2.16  2.88  3.60  4.32  5.04  5.76  6.48  7.20  7.92  8.6
--------------------------------------------------------------------- 
10  |  1.8   2.7   3.6   4.5   5.4   6.3   7.2   8.1   9.0   9.9  10.8
15  |  2.7   4.0   5.4   6.7   8.1   9.4  10.8  12.1  13.5  14.8  16.2
20  |  3.6   5.4   7.2   9.0  10.8  12.6  14.4  16.2  18.0  19.8  21.6
25  |  4.5   6.7   9.0  11.2  13.5  15.7  18.0  20.2  22.5  24.7  27.0
--------------------------------------------------------------------- 
30  |  5.4   8.1  10.8  13.5  16.2  18.9  21.6  24.3  27.0    -       
35  |  6.3   9.5  12.6  15.7  18.9  22.0  25.2  28.3    -             
40  |  7.2  10.8  14.4  18.0  21.6  25.2  28.8    -                   
45  |  8.1  12.2  16.2  20.2  24.3  28.3    -                         
======================================================================

======================================================================
INTENSITY & ILLUMINANCE - calculations                             103
======================================================================

                              INTENSITY

All tables show a CENTRAL INTENSITY for each fixture.  This is the 
'intensity' of the light beam along the central axis. The intensity is 
expressed in 'candela' (sometimes candlepower) and does not vary with 
distance from the fixture. Central intensity can be used to compare 
the performance of one fixture to another (of identical degrees). C.I. 
can also be used to calculate illuminance. 

                             ILLUMINANCE

Use the central intensity (C.I.) to calculate the ILLUMINANCE at  any 
distance, for any fixture. The ILLUMINANCE is the 'illumination' 
falling on a surface - and it is expressed either in footcandles  (FC) 
or Lux (LX). Typical stage lighting levels range from 10 to 200 FC.

----------------------------------------------------------------------
3.  Calculate:  ILLUMINANCE
----------------------------------------------------------------------

    To calculate ILLUMINANCE (E) any distance,
    (given: central intensity in Candela).
                                                        fixture    
    E(fc) = I (candela)    E(lux) = I (candela)                      
          -------------            -------------           I--------|
          DISTANCE} (ft.)          DISTANCE} (m.)         .|.       | 
                                                         . | .      |  
    Assumes central intensity of source is              .  |  .   Dist.
    perpendicular to surface. The distance             .   |   .    | 
    to the source must be at least 5 times            .    |    .   | 
    the minimum dimension of the source.             . . .  . . . __|
                                                           E         

Example 3: 
---------
What ILLUMINATION (in foot candles) is produced by an ALTMAN 360Q-6X22 
at a distance of 70 feet?.

Check the Fixture Tables and determine that the ALTMAN 6x22 has a 
central intensity of 219,000 candela. Now use the formula:

   INTENSITY                           219,000
   --------- = ILLUMINANCE    so:     --------- = 44.6 foot candles
   DISTANCE}                           70 x 70    ----------------- 

----------------------------------------------------------------------
4.  Calculate:  INTENSITY
----------------------------------------------------------------------

To calculate INTENSITY, (given: Illuminance and Distance):

    CANDELA = (FC or LUX) x (DISTANCE SQ.)

======================================================================

======================================================================
INTENSITY & ILLUMINANCE - tables                                   104
======================================================================

For quick calculations, use the following tables:

----------------------------------------------------------------------
INTENSITY, DISTANCE & ILLUMINANCE                           - Imperial
----------------------------------------------------------------------
 DISTANCE                   ILLUMINANCE (FC)         
    in
   feet          25        50        75       100       125        150
----------------------------------------------------------------------
   10         2,500     5,000     7,500    10,000    12,500     15,000
   20        10.000    20,000    30,000    40,000    50,000     60,000
   30        22,500    45,000    67,500    90,000   112,500    135,000
   40        40,000    80,000   120,000   160,000   200,000    240,000
   50        62,500   125,000   187,500   250,000   312,500    375,000
----------------------------------------------------------------------
   60        90,000   180,000   270,000   360,000   450,000    540,000
   70       122,500   245,000   367,500   490,000   612,500    735,000
   80       160,000   320,000   480,000   640,000   800,000    960,000
   90       202,500   405,000   607,500   810,000 1,012,500  1,215,000
  100       250,000   500,000   750,000 1,000,000 1,250,000  1,500,000
----------------------------------------------------------------------

----------------------------------------------------------------------
INTENSITY, DISTANCE & ILLUMINANCE                             - Metric
----------------------------------------------------------------------
 DISTANCE                    ILLUMINANCE (Lux)
    in
  meters        250       500       750      1000      1250       1500
----------------------------------------------------------------------
    1           250       500       700     1,000     1,250      1,500
    2         1,000     2,000     3,000     4,000     5,000      6,000
    4         4,000     8,000    12,000    16,000    20,000     24,000
    8        16,000    32,000    48,000    64,000    80,000     96,000
   10        25,000    50,000    75,000   100,000   125,000    150,000
----------------------------------------------------------------------
   15        56,250   112,500   168,750   225,000   281,250    337,500
   20       100,000   200,000   300,000   400,000   500,000    600,000
   25       156,250   312,500   468,750   625,000   781,250    937,500
   30       225,000   450,000   675,000   900,000 1,125,000  1,350,000
   35       306,250   612,500   918,750 1,225,000 1,531,250  1,837,500
----------------------------------------------------------------------

CONVERSIONS:
-----------

To convert from FC to LUX (or LUX to FC): 

LUX x .0929 = FC               FC x .10.76 = LUX

(500 LUX = 46 FC)              (50 FC = 538 LUX) 

From the author:

The STAGE LIGHTING FIXTURE TABLES are quick reference tables to common stage lighting fixtures, and intended for use by the lighting DESIGNER, TECHNICIAN, or EDUCATOR.

These tables allow you to evaluate the performance of any particular fixture and help compare one fixture against another. Further, these tables will allow you to determine the BEAM SIZE and ILLUMINANCE of any fixture, at any distance.

Many of the world’s most popular lighting fixtures are included, all manufactured in the past 25 years. Several discontinued fixtures are also shown as many are still in wide use today. New fixtures are added and the list is updated on a regular basis.

written by: Bill Williams

Stage light design

Eddition 2nd 1997-1999


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2 responses

24 09 2012
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Pretty! This has been a really wonderful article. Thank you for providing this information.

7 11 2012
kulilampu

Your welcome…

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