Watts to Lumens calculation formula
Energy saving lamps have high luminous efficacy (more lumens per watt).
The luminous flux Φv in lumens (lm) is equal to the power P in watts (W) times the efficacy η in lumens per watt (lm/W):
Φv(lm) = P(W) * η(lm/W)
Luminous efficacy conversion table
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