Illuminance Unit Converter

Convert illuminance between lux, foot-candles, phot, lumen per square meter, and other lighting measurement units. Illuminance measures how much luminous flux falls on a surface, essential for photography, architecture, and workplace lighting design.

Key Illuminance Units

Lux (lx) is the SI unit, defined as one lumen per square meter. Foot-candle (fc) is the US customary unit, measuring lumens per square foot. One foot-candle equals approximately 10.764 lux. The phot is a CGS unit equal to 10,000 lux.

Frequently Asked Questions

How do I convert lux to foot-candles?

Divide lux by 10.764 to get foot-candles, or multiply foot-candles by 10.764 to get lux. For example, 500 lux equals approximately 46.45 foot-candles.

What is a typical office lighting level?

Standard office lighting ranges from 300 to 500 lux (approximately 28 to 46 foot-candles). Reading areas may require 500 to 1000 lux.

Is lux the same as lumen per square meter?

Yes. One lux equals exactly one lumen per square meter (lm/m²). They are equivalent units with different names.

What is a nox?

A nox is a very small illuminance unit equal to one millilux (0.001 lux), used for measuring extremely low light levels.

Related: Power Converter and Energy Converter.

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Illuminance Converter