The light perceived by the human eye is measured in units called lumen-hours. This is about the amount produced by burning a candle for an hour.

人眼感受的光用流明时这个单位来衡量——燃烧一根蜡烛一个小时所产生的光的量就是一流明时。

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The light perceived by the human eye is measured in units called lumen-hours.This is about the amount produced by burning a candle for an hour.

人眼能感知的光亮是以流明-小时为单位计量的，每流明相当于一支燃烧一小时的蜡烛产生的能量。

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This is about the amount produced by burning a candle for an hour.

时约等于一支蜡烛燃烧一个小时所产生的光。

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And since a candle's burn rate is fairly consistent, they were often used to tell time--some candles even had hour measurements marked into the wax.

FORBES: No. 14 The Candle