单词 | footlambert |
释义 | > as lemmasfootlambert footlambert n. a unit of luminance equal to 1/π candela per square foot. ΘΚΠ the world > matter > light > illumination > [noun] > unit of illumination > candela > units depending on lumen1898 footlambert1915 1915 J. R. Cravath in Electr. World 10 July 61/1 The writer recently offered a suggestion that the term ‘foot-lambert’ be adopted as a substitute for the unit now called the ‘foot-candle’..of brightness. 1969 Pop. Mech. Oct. 249 Zenith's new 23-in. color TV tube..measures 49.5 foot lamberts in tests compared to only 22.8 for a conventional tube. 2012 J. Holben Shot in Dark iii. 45 Incident light (measured in footcandles) falls onto a gray wall, and 18% of the light is reflected (measured in footlamberts) toward the lens. < as lemmas |
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