Electric power in watts (W) to luminous flux in lumens (lm) calculator and how to calculate.
Enter the power in watts, luminous efficacy in lumens per watt and press the Calculate button to get the luminous flux in lumens:
* the predefined luminous efficacy values are typical / average values.
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 luminous efficacy η in lumens per watt (lm/W):
ΦV(lm) = P(W) × η(lm/W)
The luminous flux ΦV in lumens (lm) is equal to the power P in watts (W), times the luminous efficacy η in lumens per watt (lm/W):
ΦV(lm) = P(W) × η(lm/W)
So
lumens = watts × (lumens per watt)
or
lm = W × (lm/W)
What is the luminous flux of a lamp that has power consumption of 30 watts and luminous efficacy of 25 lumens per watt?
ΦV = 30 W × 25 lm/W = 750 lm
What is the luminous flux of a lamp that has power consumption of 50 watts and luminous efficacy of 25 lumens per watt?
ΦV = 50 W × 25 lm/W = 1250 lm
What is the luminous flux of a lamp that has power consumption of 70 watts and luminous efficacy of 15 lumens per watt?
ΦV = 70 W × 25 lm/W = 1750 lm
What is the luminous flux of a lamp that has power consumption of 100 watts and luminous efficacy of 25 lumens per watt?
ΦV = 100 W × 25 lm/W = 2500 lm
What is the luminous flux of a lamp that has power consumption of 200 watts and luminous efficacy of 25 lumens per watt?
ΦV = 200 W × 25 lm/W = 5000 lm
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