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 *Φ*_{V} in lumens (lm) is equal to the power P in watts (W), times the luminous efficacy * η* in lumens per watt (lm/W):

*Φ*_{V(lm)} = *P*_{(W)} × *η*_{(lm/W)}

The luminous flux *Φ*_{V} in lumens (lm) is equal to the power P in watts (W), times the luminous efficacy *η* in lumens per watt (lm/W):

*Φ*_{V(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?

*Φ*_{V} = 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?

*Φ*_{V} = 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?

*Φ*_{V} = 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?

*Φ*_{V} = 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?

*Φ*_{V} = 200 W × 25 lm/W = 5000 lm

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