Lumens to Watts calculation formula
Energy saving lamps have high luminous efficacy (more lumens per watt).
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)
Lumens to Watts conversion table
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