Illuminance Converter
Convert illuminance (how much light falls on a surface) between lux, foot-candles, phots and lumens per square meter or foot.
1 lux = 0.09290304014 foot-candles
Most used illuminance units
Popular illuminance conversions
- Lux to foot-candles 1 lx = 0.09290304 fc
- Foot-candles to lux 1 fc = 10.76391 lx
- Lux to lumens per square foot 1 lx = 0.09290304 lm/ft²
- Phots to lux 1 ph = 10,000 lx
What is illuminance?
Illuminance is the amount of light falling on a surface, measured in lux (lumens per square meter) or, in the US, foot-candles (lumens per square foot). One foot-candle is about 10.76 lux. Lighting designers use illuminance to specify how bright offices, classrooms and streets should be; light meters and phone apps measure it directly.
Illuminance units from smallest to largest
Every proportional illuminance unit on the site, ordered by size and expressed in lux.
- Millilux 0.001 lx
- Lux 1 lx
- Foot-candle 10.7639 lx
- Lumen per square foot 10.7639 lx
- Kilolux 1,000 lx
- Phot 10,000 lx
All 6 illuminance units
Units
Frequently asked questions
How many lux is 1 foot-candle?
About 10.764 lux.
How much light does an office need?
About 300–500 lux (30–50 foot-candles) on desks; detailed work needs 750–1,000 lux.