Illumination Converter
Convert light intensity units — lux, kilolux, foot-candles and phot.
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Convert illumination units
Illuminance measures how much light falls on a surface. This converter switches between the metric unit lux (lumens per square metre), kilolux, the imperial foot-candle (lumens per square foot), and the CGS unit phot. It is useful for lighting design, photography, horticulture, and workplace safety standards.
Typical light levels
| Environment | Approx. illuminance |
|---|---|
| Moonlight | ~1 lux |
| Living room | 50–150 lux |
| Office / classroom | 300–500 lux |
| Overcast daylight | ~1,000 lux |
| Direct sunlight | 32,000–100,000 lux |
Frequently asked questions
How many lux in a foot-candle?
One foot-candle equals about 10.764 lux.
What is the difference between lux and lumens?
Lumens measure the total light a source emits; lux measures how much of that light lands on a surface. One lux equals one lumen spread over one square metre.