Illuminance Converter — Lux, Foot-candle, Phot
The Illuminance Converter converts between all major illuminance units — lux, foot-candles, phot, and nox. Illuminance measures how much light falls on a surface and is used in photography, architectural lighting design, horticulture, workplace safety standards, and display calibration. This free converter handles every illuminance unit instantly.
Frequently Asked Questions
Lux (lx) is the SI unit of illuminance — it measures how much luminous flux falls on one square metre of surface. 1 lux = 1 lumen per square metre. Direct sunlight is about 100,000 lux; a well-lit office is 300–500 lux; moonlight is about 1 lux.