Illuminance
Lux and foot-candles — lighting design’s metric/imperial split.
1 Lux = 0.09290304 Foot-candle
Quick table
| Lux | Foot-candle |
|---|---|
| 0.1 | 0.009290304 |
| 0.5 | 0.04645152 |
| 1 | 0.09290304 |
| 2 | 0.18580608 |
| 5 | 0.4645152 |
| 10 | 0.9290304 |
| 25 | 2.322576 |
| 50 | 4.645152 |
| 100 | 9.290304 |
How this system works
One lux is one lumen per square metre. A foot-candle is one lumen per square foot, so 1 fc ≈ 10.764 lx. Building codes quote one or the other depending on the country that wrote the code.
Base unit: lux. Lux is SI; Foot-candle is US customary.
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