Illuminance Unit Converter | Convert between Lux, Foot-candle and more
Online illuminance unit converter supporting precise conversion between lux, foot-candle, phot, nox and other illuminance units.
Lux (lx)(lx)
Current Unit
Foot-candle (fc)(fc)
Formula:1 lx = 0.092903 fc
Calculation Process:0 lx × 0.092903 = undefined fc
Phot (ph)(ph)
Formula:1 lx = 0.0001 ph
Calculation Process:0 lx × 0.0001 = undefined ph
Nox (nx)(nx)
Formula:1 lx = 1000 nx
Calculation Process:0 lx × 1000 = undefined nx
Lumen per Square Meter (lm/m²)(lm/m²)
Formula:1 lx = 1 lm/m²
Calculation Process:0 lx × 1 = undefined lm/m²
Illuminance Unit Knowledge
Illuminance Basics
Illuminance measures the amount of light hitting a surface. The SI unit is the lux (lx), equal to 1 lumen per square meter (lm/m²). It describes how well-lit an environment is, not the brightness of the light source.
Common Illuminance Levels
- Typical illuminance values: Full sunlight: 100,000 lux
- Overcast day: 1,000 lux
- Office lighting: 300–500 lux
- Living room: 50–100 lux
- Moonlit night: 0.1 lux
- Starry night: 0.001 lux.
Foot-candle vs Lux
The foot-candle (fc) is an imperial unit still used in photography and the US construction industry. 1 foot-candle = 10.764 lux. It represents the illuminance from 1 candela at a distance of 1 foot.
Applications of Illuminance
- Lighting standards specify minimum illuminance for different environments: Surgery rooms: 10,000–20,000 lux
- Detailed workshop tasks: 1,000 lux
- Office work: 300–500 lux
- Corridors: 50–100 lux. Proper lighting improves safety and productivity.