流明
From Wikipedia, the free encyclopedia
流明（lumen，符號：lm）係國際單位制嘅光通量單位[1]，用嚟表示人眼從一個光源所接收嘅發光量，可以視為可見光嘅發光量。光通量唔同輻射通量，輻射通量係發光總能量，而光通量按人眼對唔同波長嘅光敏感程度做咗相對調整。
1 流明等於 1 坎德拉嘅光源向 1 球面度嘅範圍所發光嘅光通量。
1 lm = 1 cd·sr = 1 cd·m2·m–2
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