Illuminance plots

produced from photometry file egl91s55.ies

spacing 5 plot spacing 6 plot single luminaire plot
In left plots, specific illuminances by a continuous row of luminaires spaced 5 and 6 heights are shown in their left halves (right half concerns a single luminaire). The right plot is for a single luminaire, unrotated.

illuminance scale

Values below the scale are illuminance / 1 lx. This is for (unrealistic) “unit” case that luminaires would have lamps producing 1 klm only, would be point-like and just 1 m over the terrain.

ies2tab text output:

   
       
# IESNA: LM-63-1995
# [TEST] 763568
# [DATE] 2/24/94 
# [MANUFAC] COOPER LIGHTING
# [LUMCAT] EGL91SXX55
# [LUMINAIRE] 1000W HPS 5H X 5V FLOOD
# [LAMP] 1000W HPS CL E-25
# [_REFLECTOR] SPUN ALUMINUM
# [_REFRACTOR] CLEAR FLAT GLASS
# [_SOCKET POSITION] AXIAL
# [_LAMP LUMENS] 140000
# TILT=NONE
# Bulbs: 1, 140000 lm each
# Number of measured angles:  37 vertical,   1 horizontal ones
# Photometric type: 1,  Units type: 1
# Luminous opening diameter (and height?):   1.830  (   1.750 )
# Ballast factor: 1,  Input power: 1000 W


# Source file: egl91s55.ies
# Luminaire flux =109381 lm,
#                   78.1 % of the bulb flux
# between 75 and 90:  0.0 % of the luminaire flux
#  - this part causes just GLARE in case of road lighting and similar purposes
# 80deg and above:  max   0.0 cd / 1000 lm ,  0.0 % of the luminaire flux
# 90deg and above:  max   0.0 cd / 1000 lm ,  0.0 % of the luminaire flux
# CutOff Type: Full_CutOff    

# 62.5 deg to <67.5 deg:   max    22 cd / 1000 lm,
# 67.5 deg to < 76  deg:   max     9 cd / 1000 lm,
# maximum spec. lum. intensity  1949 cd / 1000 lm

# The following table gives luminous intensities which would be produced
# using a hypothetic bulb giving a luminous flux of 1000 lm (i.e., cd/klm):

  0.0  1815
  2.5  1949
  5.0  1711
  7.5  1264
 10.0   907
 12.5   685
 15.0   545
 17.5   455
 20.0   392
 22.5   346
 25.0   310
 27.5   282
 30.0   257
 32.5   235
 35.0   218
 37.5   206
 40.0   196
 42.5   185
 45.0   171
 47.5   153
 50.0   129
 52.5  98.5
 55.0  65.9
 57.5  43.2
 60.0  30.6
 62.5  22.2
 65.0  15.2
 67.5   9.1
 70.0   3.6
 72.5   0.1
 75.0   0.0
 77.5   0.0
 80.0   0.0
 82.5   0.0
 85.0   0.0
 87.5   0.0
 90.0   0.0