References
- KaufmanJ. E. and ChristensenJ. F. (Editors), IES Lighting Handbook, Fifth Edition, Illuminating Engineering Society of North America, New York, 1972, p. 8–37.
- IES Testing Procedures Committee, “IES approved method for photometric testing of indoor luminaires using high-intensity discharge lamps”, Journal of the Illuminating Engineering Society, Vol. 3, No. 2, January 1974, p. 160.