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。
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。
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.
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