Watts to Lux Calculator

Your details

Choose whether to convert watts into lux, or a target lux level back into watts.
For a flat surface, enter the illuminated area. For an omnidirectional point source, enter the distance (radius) and the calculator works out the sphere area.
Electrical power of the light source in watts.
W
Select your bulb type to auto-fill the typical luminous efficacy, or choose Custom to enter your own.
The illuminated surface area.
m²
IlluminanceBright (task / workshop)
600lx

Light falling on the surface per square metre

Luminous flux6,000lm
Effective area10m²
Efficacy used100lm/W
600 lx
Very dim<50Low light50-200Moderate200-500Bright500-1000Very bright1000+

600.0 lx - bright illuminance

  • Your light source produces 6000 lm of luminous flux, giving 600.0 lx of illuminance across the surface.
  • This falls in the range suitable for general offices, kitchens, and living areas (300-1000 lx).
  • A luminous efficacy of 100 lm/W is energy-efficient - typical of modern LED technology.

Next stepCompare this against the EN 12464-1 or IESNA recommended illuminance levels in the reference table below to judge whether it meets the application standard.

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