References
- D. Barclay, “Photometric Characteristics of Metal Halide Lamps.” Journal of the IES, Vol. 7, no. 3, April 1978, pp. 197–200.
- J. H. McCulloch and H. McCulloch, “Floodlight Photometry without Special Photometer and without Tipping Luminaire - A computer Application.” Illuminating Engineering, Vol. 62, April 1967, pp. 243–246.
- Levin R. E. “Geometry in Photometric Analysis,” Illum. Engr. 65: 241, 1970.