I , 光強度[cd] = 立體角內之光通量 / 立體角Ω[sr] E , 照度[lx] = 落在某面積上之光通量[lm] / 此被照面面積[㎡] = 光強度[cd] / (距離[m] )2 L , 輝度[cd/㎡]= 光強度[cd] / 所見之被照面面積[㎡] η發光效率[lm/W]= 所產生之光通量[lm] / 消耗電功率[W]
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