Conversion from lumens to watts, conversion formula lumen to watts

Conversion from lumens to watts

Conversion from luminous flux in lumens (lm) to electric power in watts

Lumens to watts  formula

The power P in watts (W) is equal to the luminous flux ΦV in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W):
P(W) = ΦV(lm) / η(lm/W)
So
watts = lumens / (lumens per watt)
or
W = lm / (lm/W)

Example

What is the power consumption of a lamp that has luminous flux of 900 lumens and luminous efficacy of 15 lumens per watt (lm/W)?

P = 900 lm / 15 lm/W = 60 W

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