单词 | footlambert |
释义 | footlambert [`fu̇t ¦lam·bǝrt] 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. |
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