Bril
Bril :
A unit used to express the "brilliance" or subjective brightness of a source of light. The scale used is logarithmic: an increase of 1 bril means doubling the luminance (and thus the actual amount of light energy) emitted by the source. A luminance of 1 lambert is defined to have a brilliance of 100 brils. Mathematically, the brilliance in brils equals (log L)/log 2 + 100, where L is the luminance in lamberts
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