Illumination Performance Recommendations Committee of the IES: “Classification of Luminaires by Distribution,” Illuminating Engineering, Vol. 49, November 1954, p. 552.
3.
LeVereR., LevinR., and PrimroseW., “Spacing Criteria for Interior Luminaires—the Practices and Pitfalls,” Journal of the IES, Vol. 3, October 1973, p. 41.
Committee on Lighting Design Practice of the IES: “The Determination of Illumination at a Point in Interior Spaces,” Journal of the IES, Vol. 3, January 1974, p. 170.
7.
GoodbarL, “Predictions of Illumination under Downlights,” Illuminating Engineering, Vol. LIV, April 1959, p. 237.