Convert Lux to Watts

Our Lux to Watts Converter makes it easy to estimate the electrical power needed to achieve a certain light level in a given area.

Simply enter your illuminance in lux, area in square meters, and the luminous efficacy of your light source. The calculator will instantly show the lux to watts result and, optionally, the number of lamps needed.

How to Convert Lux to Watts?

To understand the calculation, you need to know what lux and watts measure:

• Lux (lx): A measure of illuminance, or how much light hits a surface, in lumens per square meter.
• Watt (W): A measure of electrical power consumption.

The lux to watts conversion formula is:

Watts = (Lux × Area) ÷ Luminous Efficacy

Where:

• Lux is your target brightness level.
• Area is in square meters.
• Luminous efficacy is how many lumens your light source produces per watt (lm/W).

Watts to Lux Calculator

1 Lux is Equal to How Many Watts?

There is no fixed answer to this because the result depends on:

1. The size of the area being lit.
2. The efficiency of the light source.
   For example, a highly efficient LED (100 lm/W) will need much less power than an incandescent bulb (15 lm/W) to achieve the same lux.
3. Lux to Watts Conversion Table
4. Below is a lux to watts conversion table assuming:
5. Area: 1 m²
6. Luminous Efficacy: 100 lm/W (typical LED)

Example Conversions

Here are some quick lux to watts examples for 1 m² area with a luminous efficacy of 100 lm/W:

• 10 lux to watts: 0.10 W
• 20 lux to watts: 0.20 W
• 100 lux to watts: 1 W
• 200 lux to watts: 2 W
• 500 lux to watts: 5 W
• 600 lux to watts: 6 W
• 1000 lux to watts: 10 W
• 2500 lux to watts: 25 W
• 3000 lux to watts: 30 W
• 10000 lux to watts: 100 W

Lux to Watts Conversion Table

Below is a lux to watts conversion table assuming:

• Area: 1 m²
• Luminous Efficacy: 100 lm/W (typical LED)

More Lux Conversions:

Lux to Lumens

Lux to Candela