Watts To Lumens Calculator

Enter power in watts: W
Enter light source:
Or enter luminous efficacy in lumens per watt: lm/W
Luminous flux result in lumens: lm

Definition Lumens & Watts

Lumens The SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.

Watts – Watts is a combination of Amps and volts. Watts is a measurement of the amount of energy being released. The higher the wattage is, the more power and output from the appliance.

How to Use Watts to Lumens Calculator

Enter the powerin watts.
Select the source of light. Eg: Halogen Lamp, LED Lamp.
Click on calculate button, you will get Luminous flux result in lumens.

Watts to Lumens Conversion

The high luminous efficacy (more lumens per watt) is used by Energy saving lamps.
The luminous flux ΦV in lumens (lm) is equal to the power P in watts (W), n times the luminous efficacy in lumens per watt (lm/W):

ΦV(lm) = P(W) / η(lm/W)

P(W)  = Power in Watts
ΦV(lm) = Luminous flux in Lumens
η(lm/W) = Luminous Efficacy in Lumens per Watt.

Convert lumens to watts

Watts To Lumens Calculator

Power in watts (W) Light source Luminous efficacy in lumens per watt (lm/W) Luminous flux result in lumens (lm)
30 Tungsten incandescent light bulb 15 450
30 Halogen lamp 20 600
30 Fluorescent lamp 60 1800
30 LED lamp 90 2700
30 Metal halide lamp 87 2610
30 High pressure sodium vapor lamp 117 3510
30 Low pressure sodium vapor lamp 150 4500
30 Mercury vapor lamp 50 1500
40 Tungsten incandescent light bulb 15 6000
50 Halogen lamp 20 1000
60 Fluorescent lamp 60 3600
70 LED lamp 90 6300
80 Metal halide lamp 87 6960
90 High pressure sodium vapor lamp 117 10530
100 Low pressure sodium vapor lamp 150 15000
110 Mercury vapor lamp 50 5500