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80% Ceiling; 50% Walls; 20% Floor
Room Surface Reflectances:
100 Watt A-19
1750 Lumens Per Lamp
RCR = 10 (Rm. Width - Mtg. Ht. above work plane)
RCR = 5 (Rm. Width - 2 x Mtg. Ht. above work plane)
RCR = 1 (Rm. Width - 10 x Mtg. Ht. above work plane)
Center To Center Distance Of Fixtures In Feet
Area Per Fixture In Square Feet
Initial Footcandles
10987653 4
105907560453015
60
50
40
30
20
10
90
60
30
Coefficients of Utilization
%
Effective Ceiling Cavity Reflectance
80 70 50 30 10 0
Room Cavity Ratio
20% Floor Cavity Reflectance
Conversion Factor: For 100W A19 units with gold reflector, multiply C.U.’s by 0.9.
50 30 10 50 30 10 50 30 10 50 30 10 50 30 10 0
.65 .63 .62 .64 .62 .61 .61 .60 .59 .59 .58 .58 .57 .56 .56 .55
.61 .59 .57 .60 .58 .56 .58 .56 .55 .56 .55 .54 .55 .54 .53 .52
.57 .54 .52 .56 .54 .52 .55 .53 .51 .53 .52 .50 .52 .51 .49 .48
.53 .50 .48 .53 .50 .48 .52 .49 .47 .50 .48 .47 .49 .48 .46 .45
.50 .47 .44 .50 .47 .44 .49 .46 .44 .48 .45 .43 .47 .45 .43 .42
.47 .44 .41 .47 .43 .41 .46 .43 .41 .45 .42 .41 .44 .42 .40 .39
.44 .40 .38 .43 .40 .38 .43 .40 .38 .42 .39 .38 .41 .39 .37 .36
.41 .37 .35 .41 .37 .35 .40 .37 .35 .39 .37 .35 .39 .36 .35 .34
.38 .35 .32 .38 .34 .32 .37 .34 .32 .37 .34 .32 .36 .34 .32 .31
.36 .32 .30 .35 .32 .30 .35 .32 .30 .34 .31 .30 .34 .31 .29 .29
1
2
3
4
5
6
7
8
9
10
% WALL REFLECTANCE
DEG CP ZONAL FLUX
0 559 13
5 575 43
10 641 83
15 769 135
20 852 177
25 775 165
30 507 114
35 307 89
40 245 91
45 259 95
50 120 9
55 6 1
60 2 0
65 2 1
70 0 0
75 2 1
80 1 1
85 0 1
ZONE LUMENS LAMP FIXT
0- 30 617 35.4 60.6
0- 40 819 47.1 80.5
0- 60 1014 58.3 99.6
0- 90 1018 58.5 100.0
90- 180 0 0.0 0.0
0- 180 1018 58.5 100.0
ZONAL SUMMARY
Candlepower Summary
Total Luminaire Efficiency = 58.5 %
CIE Type - Direct
Luminous Diameter: 4.500
Spacing Ratio= 1.1
ITL REPORT NO. 31338
DATE 9-27-85
Lamp: 100 Watt A19
Efficiency: 58.5%
Use quick calculator chart to determine spacing of luminaires for desired level of illu-
mination.
Conversion Factor: 100W A19 (gold): F.C. x 0.90
Calculite
®
Incandescent Open Downlight G7057
Page 2 of 2 4 1/2" Aperture A19 Lamp Horizontal
Lightolier a Genlyte Thomas Company www.lightolier.com
631 Airport Road, Fall River, MA 02720 • (508) 679-8131 • Fax (508) 674-4710
We reserve the right to change details of design, materials and finish.
© 2002 Genlyte Thomas Group LLC (Lightolier Division) • A0902
Job Information Type: