ルクス
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定義
SIの照度の単位で、単位面積あたりに受ける光束を測定する。1ルクスは1平方メートルあたり1ルーメンに等しい（1 lx = 1 lm/m²）。
解説
Direct sunlight delivers about 100,000 lux; an overcast sky provides 1,000 lux; office lighting is typically 300–500 lux; a full moon produces roughly 0.25 lux. The key difference from lumens: lumens measure total light output from a source, while lux measures how much of that light reaches a surface. Moving a lamp twice as far away reduces illuminance by a factor of four (inverse-square law).
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