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How to use Illuminance Converter

Type an illuminance in any field. It converts to lux with the unit factor, then fills the other illuminance units instantly.

Frequently asked questions

How many lux is one foot-candle?

1 fc equals 10.7639104167 lux — one lumen per square foot versus per square metre.

What is the base unit?

The lux (lumen per square metre) is the base; all other units convert through it.

What is a phot?

1 phot equals 10,000 lux (1 lumen/cm²), a CGS illuminance unit.

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