Illuminance Converter
Convert illuminance among lux, foot-candles, phot, and nox using lux as the reference.
How to use
- Enter the illuminance reading and choose the meter/source and target units from lux, foot-candle, phot, and nox.
Capabilities and scope
Compare units for luminous flux incident per area, from SI lux to several non-SI illuminance units.
How it works
Reference factors are 1 foot-candle≈10.7639104 lx, 1 phot=10,000 lx, and 1 nox=0.001 lx.
Example
100 foot-candles is about 1076.391 lux.
Useful for
- Compare lighting specifications in fc and lux
- Translate legacy phot/nox data into lux
- Reconcile illuminance meters using different units
Before you use it
- Illuminance and luminance are different quantities, so lux cannot be directly converted to cd/m².
Standards and references
Frequently asked questions
Can I convert lux to nits?
No. Lux describes incident illuminance while nit (cd/m²) describes luminance; optical context is required.