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Conversion Factors:
Use quick calculator chart to determine spacing of luminaires for desired level of illumination.
75W PAR30 (Gold): F.C. X 1.0; (Black): F.C. x 0.6
50W PAR30 (Clear or Gold): F.C. X 0.7; (Black): F.C. x 0.4
80% Ceiling; 50% Walls; 20% Floor
Room Surface Reflectances:
75 Watt PAR30
1275 Lumens Per Lamp
RCR = 10 (Rm. Width - Mtg. Ht. above work plane)
RCR = 5 (Rm. Width - 2Mtg. 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
3 1110
9
85 6 74
30 30 30 30 30 30
80
10
20
30
40
50
60
70
Coefficients of Utilization
% Effective Ceiling Cavity Reflectance
80 70 50 30 10 0
Room Cavity Ratio
20% Floor Cavity Reflectance
50 30 10 50 30 10 50 30 10 50 30 10 50 30 10 0
1.11 1.10 1.08 1.09 1.08 1.06 1.05 1.04 1.03 1.02 1.01 1.00 .98 .96 .97 .96
1.07 1.04 1.02 1.05 1.03 1.01 1.02 1.00 .98 .99 .98 .96 .97 .96 .95 .93
1.03 1.00 .97 1.01 .99 .97 .99 .97 .95 .97 .95 .94 .95 .94 .92 .91
.99 .96 .94 .99 .96 .93 .97 .94 .92 .95 .93 .91 .93 .91 .90 .89
.96 .92. 90 .95 .92 .89 .94 .91 .89 .92 .90 .88 .91 .89 .87 .86
.93 .90 .87 .93 .89 .87 .91 .89 .86 .90 .88 .86 .89 .87 .85 .84
.90 .87 .84 .90 .86 .84 .89 .86 .84 .88 .85 .83 .87 .84 .83 .82
.88 .84 .82 .87 .84 .81 .86 .83 .81 .86 .83 .81 .85 .82 .80 .79
.85 .81 .79 .84 .81 .79 .84 .81 .78 .83 .80 .78 .82 .80 .78 .77
.83 .79 .76 .82 .79 .76 .82 .78 .76 .81 .78 .76 .81 .76 .75 .75
1
2
3
4
5
6
7
8
9
10
% WALL REFLECTANCE
Conversion Factor: For 50W and 75W PAR30 units with clear or gold reflector, multiply
C.U.’s by 1.0; with black reflector, multiply C.U.’s by 0.6.
1000
2000
90°
60°
30°
3000
4000
ZONAL
DEG CP FLUX
0 2651
5 2630 246
10 2379
15 1948 530
20 1424
25 879 392
30 373
35 98 78
40 9
45 1 1
50 1
55 0 1
60 1
65 0 1
70 1
75 1 1
80 1
85 1 1
90 1
ZONE LUMENS LAMP FIXT
0-30 1168 91.63 93.48
0-40 1245 97.71 99.68
0-60 1247 97.86 99.84
0-90 1249 98.02 100.00
40-90 3 .31 .32
60-90 2 .16 .16
90-180 0 .00 .00
0-180 1249 98.02 100.00
ZONAL SUMMARY
CANDLEPOWER SUMMARY
Spacing Ratio = 0.7
Certified Report No. 1905
Computed by LSI program
Date: 09-02-98
Efficiency: 98.0%
B7705CL PAR30 75W FL
FL
20
40
50
80
100
120
Calculite
®
Incandescent Open Downlight B7705
Page 2 of 2 6” Aperture BR30 / PAR30 Lamp
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
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