Illumination Converter

Convert illuminance between lux, foot-candles, phots, and nox.

Convert light levels instantly. Free lux, foot-candle and phot converter for lighting design, photography and workplaces.

About Light Units

Convert illuminance between lux, foot-candles, phots, and nox.

Illuminance is light landing on a surface. Offices target 300–500 lux; a bright sunny day hits 100,000. Convert between metric lux, imperial foot-candles, cgs phots, and the tiny nox for night-vision contexts.

Do not confuse illuminance (lux, on surfaces) with luminance (nits, emitted by screens) — different quantities entirely. Everything runs in your browser.

Where it is used

Office lighting compliance (300–500 lux), photography exposure, warehouse specs quoted in foot-candles.

How to use the Light Units

  1. Value — enter the value (e.g. 500).
  2. From — enter the value.
  3. To — enter the value.
  4. Calculate — press the Calculate button to see the result instantly above.

Formula

Anchor to lux (1 foot-candle ≈ 10.764 lux, 1 phot = 10,000 lux).

Examples

Example

value:500
from:lux
to:ft-cd
Result: 500 Lux = 46.45 Foot-candles

Frequently Asked Questions

How many lux for office work?
300–500 lux for general office tasks, 750+ for detailed drafting. Corridors manage with 100.
Lux vs lumens?
Lumens measure light emitted by a source; lux measures what lands on each square meter. One lux equals one lumen per square meter.
What is a foot-candle?
Illuminance from one candela one foot away — about 10.764 lux. Still standard in US lighting specs.
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