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Illumination Converter
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From
To
Sig. figures:
Lux
lx
500(input)
Kilolux
klx
0.5
Millilux
mlx
500000
Microlux
μlx
5.00000e+8
Lumen per square metre
lm/m²
500
Phot
ph
0.05
Milliphot
mph
50
Foot-candle
fc
46.4515
Millifoot-candle
mfc
46451.5
Lumen per square foot
lm/ft²
46.4515
Nox
nox
500000
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Convert illuminance across 11 units: SI (lux, klux, mlux, μlux, lm/m²), CGS (phot = 10,000 lux, milliphot = 10 lux), Imperial (foot-candle = 10.764 lux, millifoot-candle, lm/ft²), and nox (10⁻³ lux). Reference: sunlight 100,000 lux, office 300–500 lux, full moon ≈ 1 lux, night ≈ 0.001 lux. 100% browser-based.
How to Use
- 1Type an illuminance value (e.g. 500 for 500 lux - typical office)
- 2Select your starting unit (e.g. lux, foot-candle, phot)
- 3Select your target unit - the result appears instantly
- 4All 11 conversions appear across SI, CGS, Imperial, and Other groups
- 5Hover any row to copy or use as input; click ⇄ to swap
- 6Open 'Illumination reference values' for common lighting scenarios
Features
- 11 illuminance units across SI, CGS, Imperial, and Other
- Lux, klux, mlux, μlux, lm/m², phot, milliphot, foot-candle, millifoot-candle, lm/ft², nox
- Reference: sunlight, cloudy day, office, full moon, starlight
- Adjustable significant figures and scientific notation toggle
- One-click copy per result
- 100% browser-based
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