单词 | lumen-second |
释义 | > as lemmaslumen-second lumen-second n. see lumen-hour n. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] > unit of light intensity > specific measurements candle-metre1908 lumen-hour1925 lumen-second1930 1930 tr. L. P. Clerc's Photogr. ii. 7/2 The unit of exposure is the lumen-second or candle-metre-second. 1958 Newnes Compl. Amateur Photogr. x. 110 The light output of a flash~bulb is measured in lumen seconds. < as lemmas |
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