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Photometry & Lighting Architecture

Illuminance & Light Unit Converter

Convert light intensity between Lux (lx), Foot-candles (fc), Phot, and Lumens per square meter with workspace lighting guidelines.

Lighting Environments:

All Equivalent Light Ratings

Understanding Illuminance

Illuminance measures the total luminous flux incident on a surface per unit area. The metric SI unit is the Lux (1 Lux = 1 Lumen per square meter). In US commercial building codes, Foot-candles (1 fc = 1 Lumen per square foot) are universally specified.

Frequently Asked Questions

How do you convert Lux to Foot-candles?

Divide Lux by 10.76391 (Foot-candles = Lux / 10.764). For example, 500 Lux equals approximately 46.45 foot-candles.

What is the difference between Lumens and Lux?

Lumens measure the total light output emitted by a bulb in all directions. Lux measures how concentrated that light is on a specific work surface (Lux = Lumens / Area).

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