Lux
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Definition
Die SI-Einheit der Beleuchtungsstärke, die den pro Flächeneinheit empfangenen Lichtstrom misst: ein Lux entspricht einem Lumen pro Quadratmeter (1 lx = 1 lm/m²).
Erklärung
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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RELATED TERMS
Meter
Die SI-Basiseinheit der Länge, definiert als die Strecke, die Licht in 1/299.792.458 Sekunden zurücklegt.
Kilogramm
Die SI-Basiseinheit der Masse, definiert über das Planck'sche Wirkungsquantum.
Sekunde
Die SI-Basiseinheit der Zeit, definiert über den Cäsium-133-Atom.
Kelvin
Die SI-Basiseinheit der Temperatur, beginnend beim absoluten Nullpunkt.
Ampere
Die SI-Basiseinheit der elektrischen Stromstärke.