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单词 lumen-second
释义

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lumen-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.
extracted from lumenn.
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更新时间:2024/12/23 11:50:30