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Lightolier 782 Folheto

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Incandescent Open Downlight
782/7082
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4 1/2” Aperture T4 (T.H.) Ellipsoidal Reflector
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:
Use quick calculator chart to determine spacing of luminaires for desired level of illumination.  
80% Ceiling; 50% Walls; 20% Floor
Room Surface Reflectances:
250 Watt T-4 tungsten Halogen
4800 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
21
19
20
18
17
16
14
13
11
15
10
12
9
8
7
4 5 6
50
100
150
200
250
300
350
400
10
20
30
40
50
60
70
80
90
100
Use quick calculator chart to determine spacing of luminaires for desired level of illumination.  
80% Ceiling; 50% Walls; 20% Floor
Room Surface Reflectances:
250 Watt T-4 tungsten Halogen
4800 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
21
19
20
18
17
16
14
13
11
15
10
12
9
8
7
4 5 6
50
100
150
200
250
300
350
400
10
20
30
40
50
60
70
80
90
100
1000
2000
90
60
30
3000
4000
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
.89 .87 .86 .87
.86 .85 .84
.83 .82 .81
.80 .79
.79
.78 .77 .76
.84 .81 .78 .82
.80 .78 .80
.78 .76 .77
.76 .74
.75
.74 .73 .72
.79 .76 .73 .78
.75 .72 .76
.73 .71 .74
.72 .70
.72
.71 .69 .68
.75 .71 .68 .74
.70 .68 .72
.69 .67 .71
.68 .66
.69
.67 .65 .64
.71 .67 .64 .70
.66 .63 .69
.65 .63 .67
.64 .62
.66
.64 .62 .61
.67 .63 .60 .67
.63 .60 .66
.62 .60 .65
.62 .59
.64
.61 .59 .58
.64 .60 .57 .64
.60 .57 .63
.59 .57 .62
.59 .56
.61
.58 .56 .55
.61 .57 .54 .60
.56 .54 .60
.56 .54 .59
.56 .53
.58
.55 .53 .52
.58 .53 .51 .57
.53 .50 .56
.53 .50 .56
.52 .50
.55
.52 .50 .49
.54 .50 .47 .54
.50 .47 .53
.50 .47 .53
.49 .47
.52
.49 .47 .46
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 CA
VITY RA
TIO
20% FLOOR CAVITY REFLECTANCE
50 30
10
50
30
10
50
30
10
50
30
10
50
30
10
0
.89 .87 .86 .88
.86 .84 .84
.83 .82 .81
.80
79
.79
.78 .77 .75
.83 .80 .77 .82
.79 .76 .79
.77 .75 .77
.75 .73
.74
.73 .71 .70
.77 .73 .70 .76
.72 .69 .74
.71 .68 .72
.69 .67
.70
.68 .66 .65
.72 .67 .64 .71
.67 .63 .69
.65 .63 .67
.64 .62
.66
.63 .61 .60
.67 .62 .58 .66
.61 .58 .64
.60 .57 .63
.60 .57
.62
.59 .56 .51
.62 .57 .54 .62
.57 .54 .60
.56 .53 .59
.56 .543
.58
.55 .52 .51
.58 .53 .49 .58
.53 .49 .56
.52 .49 .55
.52 .49
.55
.51 .49 .47
.54 .49 .45 .53
.48 .45 .52
.48 .45 .51
.47 .45
.51
.47 .44 .43
.49 .44 .41 .49
.44 .41 .48
.44 .40 .47
.43 .40
.47
.43 .40 .39
.46 .40 .37 .45
.40 .37 .44
.40 .37 .44
.40 .37
.43
.39 .37 .35
1
2
3
4
5
6
7
8
9
10
% WALL REFLECTANCE
2500
5000
90
60
30
7500
10000
SOCKET IN LOW POSITION (PRE-SET)
SOCKET IN HIGH POSITION (RE-SET IN FIELD)
I.T.L, INC. REPORT NO. 12425
DATE: 1-14-70
I.T.L, INC. REPORT NO. 12323
DATE: 12-8-69
SPACING RATIO = 1.4
SPACING RATIO = 0.4
DEG
CP
ZONAL FLUX
0
2482
2  1/2
2453
58
7 1/2
2159
154
12 1/2
2152
255
17 1/2
2639
436
22 1/2
3299
692
27 1/2
2855
723
32 1/2
2539
748
37 1/2
1915
639
42 1/2
230
85
47 1/2
57
23
55
47
42
65
9
11
75
6
6
85
2
2
ZONE
LUMENS
% LAMP
% FIX
0-30
2318
48.3
59.8
0-40
3705
77.2
95.6
0-60
3855
80.3
99.5
0-90
3874
80.7
100
Candlepower Summary
DEG
CP
ZONAL FLUX
0
10520
1
10480
400
3
9160
105
5
7710
147
7
6810
183
9
6100
210
11
5360
224
13
4950
245
15
4660
265
17
4249
273
19
3710
265
25
2310
1070
35
1106
695
45
66
51
55
21
19
65
12
12
75
6
6
85
3
2
Candlepower Summary
ZONE
LUMENS
% LAMP
% FIX
0-30
3027
62.9
79.2
0-40
3722
77.3
97.4
0-60
3792
78.8
99.2
0-90
3812
79.3
100