Die Beleuchtungsstärke ist die Lichtstrahlung einer Lichtquelle, die an einem beliebigen Punkt eintrifft. Sie kann dort mit einem Lux-Meter gemessen werden. Normiert man diese Strahlung auf einen Quadratmeter erhält man den Lichtstrom in Lumen [lm].
Beleuchtungsstärke E = Lichtstrom ϕ / Fläche A
E = ϕ / A, [lx] = [lm] / [m²]
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