How it works
Convert illuminance by multiplying the input by its source-unit factor and dividing by its destination-unit factor. Base unit: lux.
Input definitions
- Amount
- Enter the value in the labeled unit.
- From unit
- Choose lux / phot / foot-candle.
- To unit
- Choose lux / phot / foot-candle.
A worked example
- Amount
- 1
- From unit
- foot-candle
- To unit
- lux
Assumptions & limits
Illuminance is luminous flux incident per unit area. Foot-candle is one lumen per square foot; this is not luminance or luminous intensity. Results use up to 12 significant digits, with scientific notation for small values; values are processed locally.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-18. Content checked against the stated method and examples. Our verification approach.
Common questions
Which unit convention does this converter use?
Illuminance is luminous flux incident per unit area. Foot-candle is one lumen per square foot; this is not luminance or luminous intensity.
How does Illuminance converter work?
Convert illuminance by multiplying the input by its source-unit factor and dividing by its destination-unit factor. Base unit: lux.
What should I check before using Illuminance converter?
Illuminance is luminous flux incident per unit area. Foot-candle is one lumen per square foot; this is not luminance or luminous intensity. Results use up to 12 significant digits, with scientific notation for small values; values are processed locally.