Lightolier 7782 specifications Spacing Ratio =

	Calculite® Incandescent Open Downlight 782/7782
Page 2 of 2	4 1/2” Aperture A19/A21/A23/MB19 Ellipsoidal Reflector

	40							100W A19
	35							1700 Lumens Per Lamp
FOOTCANDLES								80% Ceiling; 50% Walls; 20% Floor
	30							RCR = 1 (Rm. Width - 10 x Mtg. Ht. above work plane)
								RCR = 5 (Rm. Width - 2 x Mtg. Ht. above work plane)
	25							RCR = 10 (Rm. Width - Mtg. Ht. above work plane)
								Room Surface Reflectances:
INITIAL	20
	15
	10
	5
			20		40	60		80	100	120	140	160	180
							AREA PER FIXTURE IN SQUARE FEET
	3	4	5	6	7	8		9	10	11	12	13	14
					CENTER TO CENTER DISTANCE OF FIXTURES IN FEET

Use quick calculator chart to determine spacing of luminaires for desired level of illumination. Conversion Factors: 150W A21; F.C. X 1.3

SPACING RATIO = 1.3

	60					150W A23
FOOTCANDLES						2700 Lumens Per Lamp
	50					80% Ceiling; 50% Walls; 20% Floor
						RCR = 1 (Rm. Width - 10 x Mtg. Ht. above work plane)
						RCR = 5 (Rm. Width - 2 x Mtg. Ht. above work plane)
	40					RCR = 10 (Rm. Width - Mtg. Ht. above work plane)
						Room Surface Reflectances:
INITIAL	30
	20
	10
			25		50	75		100	125
					AREA PER FIXTURE IN SQUARE FEET
	3	4	5	6	7	8	9	10	11	12

CENTER TO CENTER DISTANCE OF FIXTURES IN FEET

Use quick calculator chart to determine spacing of luminaires for desired level of illumination.

SPACING RATIO = 1.2

			Candlepower Summary
	90		DEG	CP	ZONAL FLUX
		2	1/2	555	13
		7	1/2	665	48
		12	1/2	745	88
200	60	17	1/2	755	124
		22	1/2	685	144
		27	1/2	595	151
400		32	1/2	427	126
		37	1/2	197	66
		42	1/2	59.0	22
600		47	1/2	16.2	7
		52	1/2	3.2	1
800	30
E.T.L, INC. REPORT NO. 385348-A		ZONE		LUMENS	% LAMP
11-14-62		0-30		568	33.5
		0-40		760	44.5
EFFICIENCY: 46.5%		0-60		790	46.5

90

200

60

400

600

30

800

E.T.L, INC. REPORT NO. 385349-1 12-06-62

EFFICIENCY: 38.5%

Candlepower Summary

	DEG	CP	ZONAL FLUX
2	1/2	825	20
7	1/2	900	64
12	1/2	980	116
17	1/2	880	185
22	1/2	880	185
27	1/2	710	180
32	1/2	530	156
37	1/2	282	94
42	1/2	117	43
47	1/2	38.4	16
52	1/2	11.4	5

ZONE	LUMENS	% LAMP
0-30	727	27.0
0-40	977	36.0
0-60	1042	38.5

COEFFICIENTS OF UTILIZATION

%EFFECTIVE CEILING CAVITY REFLECTANCE

			80				70			50			30			10		0
		50	30	10				% WALL REFLECTANCE							50	30	10	0
						50	30	10	50	30	10	50	30	10
	1	.52	.51	.50	.51		.50	.49	49	.48	.48	.47	.47	.46	.46	.45	.45	.44
RATIO	2	.49	.47	.46	.48		.47	.45	.47	.46	.45	.45	.44	.44	.44	.43	.43	.42
	3	.47	.45	.43	.46		.44	.43	.45	.43	.42	.44	.42	.41	.43	.41	.41	.40
CAVITY	4	.44	.42	.40	.44		.42	.40	.43.	.41	.40	.42	.40	.39	.41	.39	.39	.38
	6	.40	.37	.36	.39		.37	.35	.39	.37	.35	.38	.36	.35	.37	.36	.35	.34
ROOM	5	.42	.39	.38	.41		.39	.38	.40	.39	.37	.40	.38	.37	.39	.38	.37	.36
	7	.38	.35	.33	.37		.35	.33	.37	.35	.33	.36	.34	.33	.36	.34	.33	.32
	8	.35	.33	.31	.35		.33	.31	.35	.33	.31	.34	.32	.31	.34	.32	.31	.30
	9	.34	.31	.29	.33		.31	.29	.33	.31	.29	.32	.31	.29	.32	.30	.29	.29
	10	.32	.29	.28	.32		.29	.28	.31	.29	.28	.31	.29	.28	.31	.29	.27	.27

20% FLOOR CAVITY REFLECTANCE Conversion Factor: For 150W A21 units, multiply C.U.’s by 0.9

						COEFFICIENTS OF UTILIZATION
					% EFFECTIVE CEILING CAVITY REFLECTANCE
			80				70			50			30			10		0
		50	30	10				% WALL REFLECTANCE							50	30	10	0
						50	30	10	50	30	10	50	30	10
	1	.43	.42	.41	.42		.41	.40	.40	.40	.39	.39	.38	.38	.38	.37	.37	.36
RATIO	2	.40	.39	.38	.40		.38	.37	.38	.37	.37	.37	.37	.36	.36	.36	.35	.34
	3	.38	.36	.35	.38		.36	.35	.37	.35	.34	.36	.35	.34	.35	.34	.33	.33
CAVITY	4	.36	.34	.33	.36		.34	.33	.35	.33	.32	.34	.33	.32	.33	.32	.31	.31
	6	.32	.30	.29	.32		.30	.29	.31	.30	.29	.31	.30	.28	.30	.29	.28	.28
ROOM	5	.34	.32	.31	.34		.32	.30	.33	.31	.30	.32	.31	.30	.32	.31	.30	.29
	7	.30	.28	.27	.30		.28	.27	.30	.28	.27	.29	.28	.27	.29	.28	.26	.26
	8	.29	.27	.25	.29		.27	.25	.28	.26	.25	.28	.26	.25	.28	.26	.25	.25
	9	.27	.25	.24	.27		.25	.24	.27	.25	.23	.26	.25	.23	.26	.24	.23	.23
	10	.26	.24	.22	.25		.23	.22	.25	.23 .22		.25	.23	.22	.25	.23	.22	.21
							20% FLOOR CAVITY REFLECTANCE

Job Information	Type:
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