Lumens to lux calculator

Enter luminous flux in lumens: lm
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Illuminance result in lux: lx

The lumen is a measure of the total "amount" of visible light. The lumen is the SI derived unit of luminous flux (symbol: lm).

The lux is a measnure luminous flux per unit area. It is the SI unit of illuminance and luminous emittance (symbol: lx).

Ev(lx) = ΦV(lm) / (4·π·r 2(m2))

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