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Unit Conversion
Illumination Converter
Convert lux, foot-candles and other illuminance units instantly. Check the formula and estimate lux from lumens and illuminated area.
Illuminance unit converter
Result—
Calculation
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All equivalent values
Lumens to lux
Average illuminance——
Luminous flux (lm)—→Illuminated area—→Average illuminance—
Calculation
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Assumes all entered lumens reach and are distributed evenly over the area. Real installations differ because of beam direction, distance and losses.
Interactive light-distance simulator
Move the lamp or use the sliders to see how illuminance changes at the measuring surface.
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Drag the lamp to change distance
Illuminance by distance
0 cd10,000 cd
0.5 m10 m
Illuminance (lx)——
Calculation
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Idealized point source aimed perpendicularly at the surface, without obstruction, reflections or losses. This illustration is not a lighting plan.
Light quantities are different
Luminous flux (lm)
Luminous intensity (cd)
Illuminance (lx)
Luminance (cd/m²)
Lumens describe light output; lux describes light arriving per unit area. Candela describes directional intensity, while cd/m² describes apparent surface brightness. They are not interchangeable by a fixed factor.
Flame is a legacy approximate unit (1 flame ≈ 4 fc). The W/cm² option applies only to monochromatic light at 540 THz (about 555 nm); other spectra have no fixed conversion to lux.
Illumination Converter FAQ
How do I use the Illumination Converter?
Enter a value, select the source unit and target unit, and the Illumination Converter will show the converted result.
Are the Illumination Converter results accurate?
For standard unit conversions, the tool uses fixed conversion factors and rounds long decimal results for readability.
Can I use the Illumination Converter on mobile?
Yes. The updated layout uses larger inputs, clearer spacing, and responsive cards so the Illumination Converter works on phones, tablets, and desktop screens.
Why does this page include formulas and examples?
Formulas and examples make the result easier to audit, help users learn the calculation, and improve the page for search engines without relying on Elementor.
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