
Use quick calculator chart to determine spacing of luminaires
for desired level of illumination.
Conversion Factors:
100W A21, F.C. X 0.6
(6' x 6' x 8.5' room)
(12' x 12' x 8.5' room)
(60' x 60' x 8.5' room)
80% Ceiling; 50% Walls; 20% Floor
Room Surface Reflectances:
2880 Lumens Per Lamp
RCR = 10
RCR = 5
RCR = 1
Clear Alzak with 150W A21
CENTER TO CENTER DISTANCE OF FIXTURES IN FEET
AREA PER FIXTURE IN SQUARE FEET
INITIAL FOOTCANDLES
14131211109876543
18016014012010080604020
80
70
60
50
40
30
20
10
Use quick calculator chart to determine spacing of luminaires
for desired level of illumination.
Conversion Factors:
PAR38 FL: 100W(IR), F.C. X 1.5; 120W, F.C. X 1.4; 90W, F.C. X 0.
70W/60W(IR), F.C. X 0.8
BR30 FL: 85W, F.C. X 0.6 (S.R.=0.9); 75W, F.C. X 0.5 (S.R.=0.9);
(6' x 6' x 8.5' room)
(12' x 12' x 8.5' room)
(60' x 60' x 8.5' room)
80% Ceiling; 50% Walls; 20% Floor
Room Surface Reflectances:
1400 Lumens Per Lamp
RCR = 10
RCR = 5
RCR = 1
Clear Alzak with 100W PAR38 FL
CENTER TO CENTER DISTANCE OF FIXTURES IN FEET
AREA PER FIXTURE IN SQUARE FEET
INITIAL FOOTCANDLES
11109876543
12010080604020
80
70
60
50
40
30
20
10
COEFFICIENTS OF UTILIZATION
%
EFFECTIVE CEILING CAVITY REFLECTANCE
80 70 50 30 10 0
ROOM CAVITY RATIO
20% FLOOR CAVITY REFLECTANCE
Conversion Factor: 45W TO 120W PAR 38 FL, C.U. X 1.0. 65W TO 85W BR30 FL, C.U. X 0.85
50 30 10 50 30 10 50 30 10 50 30 10 50 30 10 0
1.01 1.00 .99 1.00 .98 .97 .96 .95 .94 .93 .92 .91 .90 .89 .89 .87
.97 .95 .93 .96 .94 .92 .93 .92 .90 .91 .89 88 .88 .87 .86 .85
.94 .91 .89 .93 .90 .88 .91 89 .87 .89 .87 86 .87 .86 .85 .84
.91 .88 .86 .90 .88 .85 .89 .86 .84 .87 .85 .83 .85 .84 .83 .82
.88 .85 .83 .87 .84 .82 .86 .84 .82 .85 .83 .81 .84 .82 .80 .79
.86 .83 .81 .85 .82 .80 .84 .82 .80 .83 .81 .79 .82 .80 .79 .78
. 83 .80 .78 .83 .80 .78 .82 .79 .78 .81 .79 .77 .80 .78 .77 .76
.81 .78 .76 .81 .78 .76 .80 .77 .76 .79 .77 .75 .79 .77 .75 .74
.79 .76 .74 .79 .76 .74 .78 .76 .74 .78 .75 .73 .77 .75 .76 .73
.77 .75 .72 .77 .75 .72 .77 74. 72 .76 .74 .72 .76 .73 .72 .71
1
2
3
4
5
6
7
8
9
10
% WALL REFLECTANCE
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
.68 .66 .65 .66 .65 .64 .64 .63 .62 .62 .61 .60 .59 .59 .58 .57
.63 .61 .58 .62 .60 .58 .60 .58 .57 .58 .57 .55 .56 .55 .54 .53
.59 .56 .53 .58 .55 .53 .56 .54 .52 .55 .53 .51 .53 .52 .50 .49
.55 .51 .49 .54 .51 .48 .53 .50 .48 .51 .49 .47 .50 .48 .47 .46
.51 .47 .44 .50 .47 .44 .49 .46 .44 .48 .45 .43 .47 .45 .43 .42
.47 .43 .41 .47 .43 .41 .46 .43 .40 .45 .42 .40 .44 .42 .40 .39
.44 .40 .37 .43 .40 .37 .42 .39 .37 .42 .39 .37 .41 .38 .36 .35
.41 .37 .34 .40 .36 .34 .39 .36 .34 .39 .36 .34 .38 .35 .33 .33
.37 .34 .31 .37 .33 .31 .37 .33 .31 .36 .33 .31 .35 .33 .31 .30
.35 .31 .28 .35 .31 .28 .34 .31 .28 .34 .30 .28 .33 .30 .28 .27
1
2
3
4
5
6
7
8
9
10
% WALL REFLECTANCE
DEG CP ZONAL FLUX
0 1319 0
5 1266 120
15 1080 306
25 1130 523
35 588 369
45 421 326
55 123 110
65 6 6
75 2 2
85 0 0
90 0 0
ZONE LUMENS LAMP FIXT
0-30 949 32.9 53.8
0-40 1318 45.8 74.8
0-60 1754 60.9 99.5
0-90 1763 61.2 100.0
90-180 0.0 0.0 0.0
0-180 1763 61.2 100.0
ZONAL SUMMARY
CANDLEPOWER SUMMARY
DEG CP ZONAL FLUX
0 4932
5 4382 404
10 3249
15 1805 541
20 777
25 373 196
30 173
35 72 57
40 45
45 38 30
50 34
55 29 20
60 0
65 0 0
70 0
75 0 0
80 0
85 0 0
90 0
ZONE LUMENS LAMP FIXT
0-30 1141 81.56 91.37
0-40 1198 85.64 95.94
0-60 1249 89.25 99.99
0-90 1249 89.26 100.00
40-90 50 3.63 4.06
60-90 0 .01 .01
90-180 0 .00 .00
0-180 1249 89.26 100.00
ZONAL SUMMARY
CANDLEPOWER SUMMARY
Spacing Ratio = 1.1 Spacing Ratio = 0.4
Tested According to IES proce-
dures. Test distance exceeds five
times the greatest luminous open-
ing of Luminaire.
Certified test report No. 0847FR
Computed by LSI program
Efficiency = 89.3%
ITL, Inc. report No. 21590
Date: 2-9-77
Efficiency: 61.2%
150W A21 150W A21
Calculite®Incandescent Surface Cylinder 7018AO
Page 2 of 2 6” Aperture A Lamp / BR30 / PAR38
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.
© 2004 Genlyte Thomas Group LLC (Lightolier Division) • B0704
Job Information Type: