Point-by-point illumination design restricts the user to determining “raw” footcandles, whereas ESI calculations permit visual performance loss due to veiling reflections to be taken into account. RQQ Report No. 5 provides the mathematical details for computing ESI from candlepower data
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References
1.
“The determination of illumination at a point in interior spaces,” Lighting Design Practice Comm, of the IES, JIES. vol. 3. no. 3, Jan., 1974.
2.
RQQ Report No. 4, “A method of evaluating the visual effectiveness of lighting systems,” Comm, on Recommendations of Quality and Quantity of Illumination of the IES, IE. August, 1970 (LM-33).
3.
RQQ Report No. 5, “The pre-determination of contrast rendition factor for the calculation of equivalent sphere illumination,” Comm, on Recommendations of Quality and Quantity of Illumination of the IES, JIES. vol. 2, no. 2, Jan., 1973 (LM-39).
