Lightolier 782 Spacing Ratio =, Coefficients of Utilization, Socket in LOW Position PRE-SET

Calculite® Incandescent Open Downlight 782/7082

Page 2 of 2

SOCKET IN LOW POSITION (PRE-SET)

100							250 Watt T-4 tungsten Halogen
							4800 Lumens Per Lamp
FOOTCANDLES
90							RCR = 1 (Rm. Width - 10 x Mtg. Ht. above work plane)
80
70							RCR = 5 (Rm. Width - 2 x Mtg. Ht. above work plane)
							RCR = 10 (Rm. Width - Mtg. Ht. above work plane)
60							Room Surface Reflectances:
50							80% Ceiling; 50% Walls; 20% Floor
40
INITIAL
30
20
10
	50			100		150		200		250	300		350	400
			AREA PER FIXTURE IN SQUARE FEET
4 5 6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21

CENTER TO CENTER DISTANCE OF FIXTURES IN FEET

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

SPACING RATIO = 1.4

		Candlepower Summary
	90	DEG	CP	ZONAL FLUX
		0	2482
	2	1/2	2453		58
1000	7	1/2	2159		154
	12	1/2	2152		255
	60	1/2	2639		436
	17
	22	1/2	3299		692
2000	27	1/2	2855		723
	32	1/2	2539		748
	37	1/2	1915		639
3000	42	1/2	230		85
	47	1/2	57		23
	30	55	47		42
4000		65	9		11
		75	6		6
		85	2		2
I.T.L, INC. REPORT NO. 12425	ZONE		LUMENS	% LAMP	% FIX
DATE: 1-14-70
	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

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	.89	.87	.86	.88		.86	.84	.84	.83	.82	.81	.80	79	.79	.78	.77	.75
RATIO	2	.83	.80	.77	.82		.79	.76	.79	.77	.75	.77	.75	.73	.74	.73	.71	.70
	3	.77	.73	.70	.76		.72	.69	.74	.71	.68	.72	.69	.67	.70	.68	.66	.65
CAVITY	4	.72	.67	.64	.71		.67	.63	.69	.65	.63	.67	.64	.62	.66	.63	.61	.60
	6	.62	.57	.54	.62		.57	.54	.60	.56	.53	.59	.56	.543	.58	.55	.52	.51
ROOM	5	.67	.62	.58	.66		.61	.58	.64	.60	.57	.63	.60	.57	.62	.59	.56	.51
	7	.58	.53	.49	.58		.53	.49	.56	.52	.49	.55	.52	.49	.55	.51	.49	.47
	8	.54	.49	.45	.53		.48	.45	.52	.48	.45	.51	.47	.45	.51	.47	.44	.43
	9	.49	.44	.41	.49		.44	.41	.48	.44	.40	.47	.43	.40	.47	.43	.40	.39
	10	.46	.40	.37	.45		.40	.37	.44	.40	.37	.44	.40	.37	.43	.39	.37	.35

20% FLOOR CAVITY REFLECTANCE

4 1/2” Aperture T4 (T.H.) Ellipsoidal Reflector

SOCKET IN HIGH POSITION (RE-SET IN FIELD)

100							250 Watt T-4 tungsten Halogen
FOOTCANDLES							4800 Lumens Per Lamp
90							RCR = 1 (Rm. Width - 10 x Mtg. Ht. above work plane)
80
70							RCR = 5 (Rm. Width - 2 x Mtg. Ht. above work plane)
							RCR = 10 (Rm. Width - Mtg. Ht. above work plane)
60							Room Surface Reflectances:
50							80% Ceiling; 50% Walls; 20% Floor
40
INITIAL
30
20
10
	50			100		150		200		250	300		350	400
			AREA PER FIXTURE IN SQUARE FEET
4 5 6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21

CENTER TO CENTER DISTANCE OF FIXTURES IN FEET

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

SPACING RATIO = 0.4

	Candlepower Summary
	DEG	CP	ZONAL FLUX
90	0	10520
	1	10480	400
	3	9160	105
2500	5	7710	147
60	7	6810	183
	9	6100	210
5000	11	5360	224
	13	4950	245
	15	4660	265
7500	17	4249	273
	19	3710	265
	25	2310	1070
30	35	1106	695
10000	45	66	51
	55	21	19
	65	12	12
I.T.L, INC. REPORT NO. 12323	75	6	6
	85	3	2
DATE: 12-8-69
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

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	.89	.87	.86	.87		.86	.85	.84	.83	.82	.81	.80	.79	.79	.78	.77	.76
RATIO	2	.84	.81	.78	.82		.80	.78	.80	.78	.76	.77	.76	.74	.75	.74	.73	.72
	3	.79	.76	.73	.78		.75	.72	.76	.73	.71	.74	.72	.70	.72	.71	.69	.68
CAVITY	4	.75	.71	.68	.74		.70	.68	.72	.69	.67	.71	.68	.66	.69	.67	.65	.64
	6	.67	.63	.60	.67		.63	.60	.66	.62	.60	.65	.62	.59	.64	.61	.59	.58
ROOM	5	.71	.67	.64	.70		.66	.63	.69	.65	.63	.67	.64	.62	.66	.64	.62	.61
	7	.64	.60	.57	.64		.60	.57	.63	.59	.57	.62	.59	.56	.61	.58	.56	.55
	8	.61	.57	.54	.60		.56	.54	.60	.56	.54	.59	.56	.53	.58	.55	.53	.52
	9	.58	.53	.51	.57		.53	.50	.56	.53	.50	.56	.52	.50	.55	.52	.50	.49
	10	.54	.50	.47	.54		.50	.47	.53	.50	.47	.53	.49	.47	.52	.49	.47	.46

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