Journal of electricity, power, and gas . any value of k there is a minimum photometriccurve for uniform illumination. This curve will giveat that particular spacing the highest illumination ef-ficency consistent with uniformity of illumination. Thefamiliar extensive, intensive and focusing reflectors aredesigned to approximate such curves. The values ofk for the extensive, intensive and focusing curves arerespectively 2, 1% and %. In other words, if it isdesired to mount the light-units at k = 2 or the heightone-half the distance apart, the most efficient curvegiving uniform illumination is th
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Journal of electricity, power, and gas . any value of k there is a minimum photometriccurve for uniform illumination. This curve will giveat that particular spacing the highest illumination ef-ficency consistent with uniformity of illumination. Thefamiliar extensive, intensive and focusing reflectors aredesigned to approximate such curves. The values ofk for the extensive, intensive and focusing curves arerespectively 2, 1% and %. In other words, if it isdesired to mount the light-units at k = 2 or the heightone-half the distance apart, the most efficient curvegiving uniform illumination is th