Illuminance Converters

Pick a family to convert between common illuminance units used in lighting and photography.

Available converter families

Common illuminance unit mirror pairs

Every direction below is a dedicated page so each conversion has a direct mirror link.

lx to klx klx to lx lx to fc fc to lx lx to ph ph to lx klx to fc fc to klx klx to ph ph to klx fc to ph ph to fc

Related by Same Conversion

Example related converter

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Explanation

Illuminance is light incident on a surface area. These factors are normalized through lux (lx), bridging SI units (lux, kilolux), imperial-style foot-candles, and CGS phot for consistent conversion in lighting and photography contexts.

How to use this hub

  1. Choose a converter family.
  2. If converting to/from grams from a volume unit, select an ingredient.
  3. For pure unit changes (volume↔volume or weight↔weight), use universal conversions.

If your conversion includes grams, you’ll choose an ingredient; otherwise you won’t.

Frequently Asked Questions

What is a foot-candle?

A foot-candle is an illuminance unit based on one lumen per square foot and is commonly used in lighting practice.

What is a phot?

A phot is a CGS illuminance unit equal to one lumen per square centimeter, which corresponds to exactly 10,000 lux.

How do I switch direction?

Use the switch button to navigate directly to the mirror page for the reverse conversion.