Converter category
Illumination Converter
Convert between lux, foot-candle, phot for illumination levels.
Universal Illumination Converter
About illumination conversions
Illuminance conversions are used in lighting design, photography, architecture, workplace safety, and agriculture. Our illumination converter covers the SI unit lux, the US customary foot-candle, and the CGS unit phot. Whether you are specifying lighting for an office, calculating exposure, or comparing international standards, this converter provides accurate illuminance conversions.
Most popular illumination conversions
Available units
Popular illumination conversions (6 total)
Unit definitions
Lux (lx)
Lux measures illuminance - lumens per square meter.
Origin: SI unit for light on a surface.
Current use: Photography, Building codes, Workplace lighting
Foot-candle (fc)
1 fc = 1 lumen/ft² = 10.76391 lux.
Origin: US standard for lighting design.
Current use: US lighting design, Real estate, Interiors
Phot (ph)
1 phot = 10,000 lux.
Origin: CGS system unit.
Current use: Scientific photography, Laboratory work
Common uses for illumination conversions
Illuminance conversions are used for lighting design, photography, building codes, workplace safety, and horticulture.
Frequently asked questions about illumination
How many lux are in 1 foot-candle?+
1 foot-candle equals approximately 10.7639 lux.
What is illuminance?+
Illuminance measures the amount of light falling on a surface. Its SI unit is the lux, equal to one lumen per square meter.
Which illumination units does this converter support?+
It supports lux, foot-candles, and phots.