Luminous flux in lumens (lm) to electric power in watts (W) calculator.

Enter the luminous flux in lumens, luminous efficacy in lumens per watt and press the *Calculate* button to get the power in watts:

* the predefined luminous efficacy values are typical / average values.

Energy saving lamps have high luminous efficacy (more lumens per watt).

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

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

Lumens | Incandescent light bulb (watts) |
Fluorescent / LED (watts) |
---|---|---|

375 lm | 25 W | 6.23 W |

600 lm | 40 W | 10 W |

900 lm | 60 W | 15 W |

1125 lm | 75 W | 18.75 W |

1500 lm | 100 W | 25 W |

2250 lm | 150 W | 37.5 W |

3000 lm | 200 W | 50 W |

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