Lightolier 7790QD - Manual (Page 2)

Conversion Factors: 150W A21, F.C. X 1.4
Use quick calculator chart to determine spacing of luminaires for desired level of illumination.
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 - 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
10 11 12 13 14 9 8 7 6 5 4 3
25 50 75 100 125 150 175 200
40
35
30
25
20
15
10
5
COEFFICIENTS OF UTILIZATION
% EFFECTIVE CEILING CAVITY REFLECTANCE
80 70 50 30 10 0
ROOM CA
VITY RA
TIO
20% FLOOR CAVITY REFLECTANCE
50 30 10 50 30 10 50 30 10 50 30 10 50 30 10 0
.59 .57 .56 .58 .56 .55 .55 .54 .53 .53 .52 .52 .51 .51 .50 .49
.54 .52 .50 .53 .51 .49 .51 .49 .48 .50 .48 .47 .48 .47 .46 .45
.50 .47 .44 .49 .46 .44 .47 .45 .43 .46 .44 .42 .45 .43 .42 .41
.45 .42 .40 .45 .42 .39 .44 .41 .39 .43 .40 .38 .41 .40 .38 .37
.42 .38 .35 .41 .38 .35 .40 .37 .35 .39 .37 .35 .38 .36 .34 .33
.38 .35 .32 .38 .34 .32 .37 .34 .32 .36 .34 .31 .036 .33 .31 30
.35 .32 .29 .35 .31 .29 .34 .31 .29 .33 .31 .29 .33 .30 .28 .28
.32 .28 .26 .32 .28 .26 .31 .28 .26 .31 .28 .26 .30 .27 .25 .25
.29 .26 .23 .29 .25 .23 .28 .25 .23 .28 .25 .23 .28 .25 .22 .22
.27 .23 .21 .27 .23 .21 .26 .23 .21 .26 .23 .21 .25 .22 .20 .19
1
2
3
4
5
6
7
8
9
10
% WALL REFLECTANCE
Conversion Factor: For 150W A21 units, multiply C.U.s by 0.9
100
200
90
60
30
300
400
500
E.T.L, Inc. report No. 390909
Date: 06-24-64
Efficiency: 52.0%
Spacing Ratio = 1.3
ZONE LUMENS LAMP
0-30 461 26.5
0-40 705 40.5
0-60 909 52.0
0-90 936 53.5
DEG CP ZONAL FLUX
0 484
5 492 47
15 551 156
25 558 258
35 389 244
45 181 140
55 71.0 64
65 25.4 25
75 2.0 2
85 0 0
90
Candlepower Summary
Calculite ® Incandescent Lensed Downlight
7790QD
Page 2 of 2 7 3/8” Aperture A19 / A21 / MB19 Fresnel Lenslite
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:
100W A19