Luminosity / Light Converter
Convert between common light measurement units including lux, foot-candles, phot, lumens, and candela. Covers illuminance, luminous flux, and luminous intensity conversions.
Light measurement involves several related but distinct quantities. Understanding the differences is key to proper conversion.
Light Measurement Types:
- Illuminance (light hitting a surface): measured in lux (lm/m²) or foot-candles (lm/ft²)
- Luminous flux (total light output): measured in lumens (lm)
- Luminous intensity (light in a direction): measured in candela (cd)
Key Conversion Factors:
- 1 foot-candle = 10.764 lux
- 1 phot = 10,000 lux
- 1 nox = 0.001 lux (used for very dim light)
Typical Illuminance Levels:
- Full daylight: 10,000-25,000 lux
- Office lighting: 300-500 lux
- Living room: 50-200 lux
- Full moonlight: 0.05-0.3 lux
- Starlight: 0.0002-0.001 lux