# Watts to lumens calculator

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:

 Enter power in watts: W Enter light source: -- select light source -- Tungsten incandescent light bulb Halogen lamp Fluorescent lamp LED lamp Metal halide lamp High pressure sodium vapor lamp Low pressure sodium vapor lamp Mercury vapor lamp Or enter luminous efficacy in lumens per watt: lm/W Luminous flux result in lumens: lm

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

Lumens to watts calculator ►

## Watts to lumens calculation

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)

## Watts to lumens calculation formula

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)

#### Example 1

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

#### Example 2

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

#### Example 3

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

#### Example 4

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

#### Example 5

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

Watts to lumens calculation ►

## Features of Watts to lumens Calculator

Our Watts to lumens Calculator allows the users to Calculate Watts to lumens . Some of the prominent features of this utility are explained below.

#### No Registration

You don’t need to go through any registration process to use the Watts to lumens Calculator. Using this utility, users to Calculate Watts to lumens as many times as you want for free.

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You don't need to go through any registration process to use this Watts to lumens Calculator. You can use this utility for free and do unlimited Watts to lumens Calculate without any limitations.