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单词 footlambert
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footlambert


footlambert

[′fu̇t ¦lam·bərt] (optics) A unit of luminance (photometric brightness), equal to 1/π candela per square foot, or to the uniform luminance of a perfectly diffusing surface emitting or reflecting light at the rate of 1 lumen per square foot; equal to approximately 3.42625 nit. Abbreviated ft-L. Also known as equivalent footcandle.

footlambert

1. A unit of luminance equal to ½ candela per sq ft. 2. The uniform luminance of a perfectly diffusing surface emitting or reflecting light at a rate of 1 lumen per sq ft.

footlambert


footlambert

Non-metric unit of luminance. It is equal to the average luminance of a surface emitting or reflecting 1 lumen per ft2. Symbol: fL. 1 fL = 3.426 cd/m2.
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更新时间:2024/12/23 10:19:57