Convert Lumens to Watts

Lumens to Watts Calculator – Quick Power Conversion
Enter the brightness in lumens, choose your bulb type, and click Calculate. The tool will instantly show how many watts are needed, helping you compare energy use and pick the most efficient lighting option.

Lumens to Watts Calculator

Find the power (watts) needed for your desired brightness using typical luminous efficacy values.

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watts (W)

Enter lumens and choose a bulb type.

Note: Actual power usage can vary by bulb brand, efficiency, and design. This tool uses typical lm/W values.


Watts to Lumens Calculator

How to Convert Lumens to Watts

Converting lumens to watts helps you estimate how much power a light source uses to produce a certain brightness. Lumens measure light output, while watts measure energy consumption.

Lumens to Watts Formula

The basic lumens to watts formula is:

Watts = Lumens ÷ Lumens per Watt

Lumens per Watt (lm/W) depends on bulb type.

  • LED: ~80–120 lm/W
  • CFL: ~55–70 lm/W
  • Incandescent: ~10–15 lm/W

For example, 800 lumens to watts for an LED (100 lm/W) = 8 watts.

Common Lumens to Watts Conversions

Here’s a quick guide using LED bulbs at 100 lm/W:

LumensWatts (LED)Watts (CFL)Watts (Incandescent)
200 lumens to watts2 W3 W13 W
300 lumens to watts3 W5 W20 W
450 lumens to watts4.5 W8 W30 W
500 lumens to watts5 W9 W33 W
600 lumens to watts6 W10 W40 W
650 lumens to watts6.5 W11 W43 W
700 lumens to watts7 W12 W47 W
750 lumens to watts7.5 W13 W50 W
800 lumens to watts8 W14 W53 W
900 lumens to watts9 W15 W60 W
1000 lumens to watts10 W17 W67 W
1100 lumens to watts11 W18 W73 W
1200 lumens to watts12 W20 W80 W
1500 lumens to watts15 W25 W100 W
1600 lumens to watts16 W27 W107 W
2000 lumens to watts20 W33 W133 W
3000 lumens to watts30 W50 W200 W

Also see:

Lighting Converters

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