Electrical Info: Articles | Lighting System Design

Following items are helpful in selecting a proper luminaire:

Utilization Factor.
Photometric Data (Luminous Intensity Diagram & Zonal Luminous Flux Diagram).
Glare Data (Glare Quality Class & Glare Limitation Curves).

By considering utilization factor along with its photometric data and glare data, complete design of a lightning system can be made.

Room Index

Room Index

Room Index
Ceiling Height above Working Plane (Feet)
For Semi-indirect and Indirect Fittings		6 and 6½	7 to 8½	9 to 10½	11 to 13½	14 to 17	18 to 21	22 to 27	28 to 33	34 to 47
Mounting Height above Working Plane (Feet)
For Direct, Semi-direct,& General Diffusing Fittings		4 and 4½	5 and 5½	6 and 6½	7 to 8½	9 to 10½	11 to 13½	14 to 17	18 to 21	22 to 27	28 to 33	34 to 47
Room Width (Feet)	Room Length (Feet)	Room Index
8½-9½	8½-10	c	b	a			Room Indices printed in small: In certain instances where normal spacing indicates the use of one, or at the most two fittings, the average illumination may not be a good indication of lighting owing to the comparatively large variation of intensity at different points on the working plane. In such cases point by point method of design should be used when direct or semi-direct fittings are employed. This also applies to general diffusion fittings. In rooms with dark decoration, but not to a fitting giving a greater upward light.
	10-14	C	B	b	a
	14-20	D	C	B	A	a
	20-30	D	D	C	B	A
	30-42	E	D	C	B	A
	42 up	F	E	D	C	B
9½-11	9½-14	D	C	b	a
	14-20	D	C	B	a	a
	20-30	E	D	C	B	a
	30-42	E	D	D	C	B
	42-60	F	E	D	C	B
	60 up	F	E	E	D/C	C
11½-12½	11½-14	D	C	B	B	a	a
	14-20	E	D	C	B	A	a
	20-30	E	D	D	C	B	A
	30-42	F	E	D	C	B	A
	42-60	F	E	E	D	C	B
	60 up	F	F	E	D	C	B
13-15	13-20	E	D	C	C	B	A	A
	20-30	F	E	D	C	B	A	A
	30-42	F	E	E	D	C	B	A
	42-60	F	F	E	E	D/C	B	A
	60-90	G	F	F	E	D	C	B/A
	90 up	G	F	F	E	E	D/C	B
16-18	16-20	F	E	D	C	B	A	A
	20-30	F	E	E	D	C	B	A
	30-42	G	F	E	D	C	C	B/A	A
	42-60	G	F	F	E	D	D/C	B	A
	60-110	G	F	F	E	D	D	C/B	A
	110 up	H	G	F	F	E	D	C	B
19-22	19-30	G	F	F	D	C	B	A	A
	30-42	G	F	F	E	D	C	B	A	A
	42-60	G	G	F	F	E	D/C	B	A	A
	60-90	H	G	F	F	E	D	C	B/A	A
	90-140	H	G	G	F	E	E/D	C	B	B
	140 up	H	G	G	F	E	E	D/C	C	B
23-26	23-30	G	F	F	E	D	C	B	A	A
	30-42	H	G	F	E	D	D/C	B	A	A
	42-60	H	G	G	F	E	D	C	B	A	A
	60-90	H	G	G	F	E	E/D	C	B	A	A	A
	90-140	H	H	G	F	F	E	D	C	B	B	A
	140 up	H	H	G	F	F	E	D	C	B	B	A
27-30	27-42	H	G	G	F	E	D	C	B	A	A
	42-60	H	H	G	G	F/E	E	D/C	C	B	A
	60-90	I	H	H	G	F	E	D	C	B	A	A
	90-140	I	H	H	G	F	F	E	D	C	B	A
	140-180	I	H	H	G	F	F	E	D	C	B	B/A
	180 up	I	H	H	G	F	F	E	D	C	C/B	B
31-36	31-42	I	H	G	E	E	E/D	C	B	B	A
	42-60	I	H	H	G	E	E	D	C	B	A	A
	60-90	J	I/H	H	H/G	F	F	E	D/C	C/B	A	A
	90-140	J	I	H	H	G	F	E	D	C	B	A
	140-200	J	I	H	H	G	F	E	E	D	C	B
	200 up	J	I	H	H	G	F	E	E	D	C	C/B
37-44	37-60	J	I	H	H/G	F	E	D	C	B	B	A
	60-90	J	I	I	H	G	F	E	D	C	B	A
	90-140	J	I	I	H	G	G	F	E	D	C/B	A
	140-200	J	J	I	H	G	G	F	E	D	C	B
	200 up	J	J	I	H	G	G	F	E	E	D/C	B
45-55	45-60	J	J	I	H	G	F	E	D	C	B	A
	60-90	J	J	I	H	H	G	F/E	E	D	C/B	A
	90-140	J	J	J/I	H	H	G	F	E	E	D/C	B
	140-200	J	J	J	I/H	H	G	F	F	E	D/C	B
	200 up	J	J	J	I/H	H	G	F	F	E	D	C
56-70	56-90	J	J	J	I	H	G	F	E	D	C	B
	90-140	J	J	J	I	H	H	G	F	E	D	C
	140-200	J	J	J	I	H	H	G	F	F	E/D	C
	200 up	J	J	J	I	H	H	G	F	F	E	D/C
71-90	71-140	J	J	J	J	I	H	G	F	E	E	D/C
	140-200	J	J	J	J	I	I	H	G	F	E	D
	200 up	J	J	J	J	I	I	H	G	F	E	E/D
91-115	91-140	J	J	J	J	J	I	H	G	G/F	E	D
	140-200	J	J	J	J	J	I	H	G	G/F	E	D
	200 up	J	J	J	J	J	I	H	H	G	F	E

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Lighting System Design

Table of Contents

Room Index

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