Illuminance plots

produced from photometry file egl91s66.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] 763052
# [DATE] 2/10/84 
# [MANUFAC] COOPER LIGHTING
# [LUMCAT] EGL91SXX66
# [LUMINAIRE] 1000W HPS 6H X 6V 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:  46 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: egl91s66.ies
# Luminaire flux = 68565 lm,
#                   49.0 % of the bulb flux
# between 75 and 90:  0.7 % of the luminaire flux
#  - this part causes just GLARE in case of road lighting and similar purposes
# 80deg and above:  max   2.4 cd / 1000 lm ,  0.4 % 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    15 cd / 1000 lm,
# 67.5 deg to < 76  deg:   max     7 cd / 1000 lm,
# maximum spec. lum. intensity   584 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   584
  2.0   582
  4.0   557
  6.0   521
  8.0   481
 10.0   443
 12.0   404
 14.0   360
 16.0   329
 18.0   300
 20.0   274
 22.0   252
 24.0   233
 26.0   215
 28.0   199
 30.0   184
 32.0   171
 34.0   161
 36.0   152
 38.0   143
 40.0   134
 42.0   123
 44.0   112
 46.0  99.2
 48.0  86.7
 50.0  75.0
 52.0  63.5
 54.0  53.2
 56.0  43.5
 58.0  35.2
 60.0  27.7
 62.0  20.9
 64.0  15.4
 66.0  10.4
 68.0   6.7
 70.0   5.2
 72.0   4.0
 74.0   3.4
 76.0   3.0
 78.0   2.5
 80.0   2.4
 82.0   2.4
 84.0   2.4
 86.0   2.4
 88.0   2.4
 90.0   0.0