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Illumination Converter

✨ Lux to foot-candles, phot, nox, and lm/m² (illuminance)—free and instant. For lighting design and photometry. No sign-up required. 💡

📏 From
🎯 To
Enter a value to see the result
Common Conversions
Quick access to frequently used conversions
Unit Information

SI Units

International System of Units (SI) measurements

lx
si
Lux
SI base unit for illuminance (1 lx = 1 lm/m²)
lm/m²
si
Lumen per Square Meter
Alternative expression: 1 lx = 1 lm/m²

CGS Units

Centimeter-gram-second system units

ph
cgs
Phot
CGS unit: 1 phot = 10,000 lx
nox
cgs
Nox
CGS unit: 1 nox = 0.001 lx (very low illuminance)

Imperial Units

Traditional British and American measurements

fc
imperial
Foot-Candle
Imperial unit: 1 fc = 10.764 lx
lm/ft²
imperial
Lumen per Square Foot
Alternative expression: 1 fc = 1 lm/ft² = 10.764 lx

decimal

Unit measurements

mlx
decimal
Millilux
1/1000 of a lux = 0.001 lx
μlx
decimal
Microlux
1/1,000,000 of a lux = 0.000001 lx
klx
decimal
Kilolux
1000 lux = 1000 lx
Mlx
decimal
Megalux
1,000,000 lux = 1,000,000 lx

Specialized Units

Domain-specific measurements

cd·sr/m²
specialized
Candela Steradian per Square Meter
Alternative expression: 1 lx = 1 cd·sr/m²
W/m²
specialized
Watt per Square Meter
Radiant flux density (approximate conversion for visible light)
Preferences

Illumination Converter

Free illumination converter: convert lux to foot-candle, foot-candle to lux, phot, and nox. This tool converts between lux (lx), foot-candle (fc), lumen per square meter, phot, and nox for lighting design, photometry, and workplace lighting. Results update instantly. No sign-up required.

Supported Unit Categories:

  • SI Units: Lux (lx), Lumen per Square Meter (lm/m²)
  • CGS Units: Phot (ph), Nox (nox)
  • Imperial Units: Foot-Candle (fc), Lumen per Square Foot (lm/ft²)
  • Decimal Multiples: Millilux (mlx), Microlux (μlx), Kilolux (klx)
  • Specialized Units: Candela Steradian per Square Meter (cd·sr/m²), Watt per Square Meter (W/m²)

Common Conversions:

  • 1 lux = 1 lm/m² = 0.0929 foot-candle
  • 1 foot-candle = 10.764 lux
  • 1 phot = 10,000 lux = 929 foot-candle
  • 1 nox = 0.001 lux = 0.000929 foot-candle

How to Use:

  1. Enter the value you want to convert in the input field
  2. Select the source unit from the "From" dropdown
  3. Select the target unit from the "To" dropdown
  4. View the converted result instantly
  5. Use the swap button to quickly reverse the conversion

Applications:

This illumination converter is essential for lighting designers, architects, photographers, safety engineers, and anyone working with light level measurements. It's particularly useful for workplace lighting design, photography, building codes compliance, and scientific research involving light intensity measurements.

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Added Oct 13, 2025

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