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Lumen

Measurement units: luminous flux
Symbol: lm
Lux per square meter to lumens Lumens to lux per square meter

info symbol: lm

The lumen is the unit of luminous flux, a measure of the total quantity of visible light emitted by a source per unit of time.

The lumen is defined in relation to the candela as

1 lm = 1 cd·sr.

1 cd × 4π sr = 4π cd⋅sr ≈ 12.57 lm.
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  • 1 lumen lm = 1*1.000000000 lux per square meter lx m²
  • 1 lumen lm = 1*0.050000000 watt halogen bulb Wbh
  • 1 lumen lm = 1*1.000000000 candelas steradians cd sr
  • 1 lumen lm = 1*0.0090909090909091 watt fluorescent tube Wft
  • 1 lumen lm = 1*0.100000000 watt incandescent bulb Wb