illuminance · US / international technical use · Modern/historical
1 fc = 1 lm/ft² ≈ 10.76391 lx
Converter
illuminance · International · Modern
lux
exact
- Record
- M039
- Definition quality
- Standardized
- Conversion mode
- multiplicative
- Calculator
- Fully calculable
Definition
1 lx = 1 lm/m²
History & use
Lux belongs to the SI photometric system derived from the candela and lumen.
Modern use
Modern use is context-dependent and varies by region or measurement system.
Sources & evidence
Source tier — · confidence high