Illumination Converter
Convert between various units of illumination (e.g., lux, foot-candle, phot).
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Understanding Illumination
Illumination is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception.
The SI unit for illumination is lux (lx), which is lumens per square meter (lm/m²).
| Situation | Illumination (lux) | Illumination (foot-candle) |
|---|---|---|
| Overcast Day | ~1000 lux | ~93 fc |
| Office Lighting | 300 – 500 lux | 28 – 46 fc |
| Full Daylight (not direct sun) | 10,000 – 25,000 lux | 930 – 2300 fc |
| Direct Sunlight | 32,000 – 100,000 lux | 3000 – 9300 fc |
| Full Moon (clear night) | ~0.1 – 0.3 lux | ~0.01 – 0.03 fc |