💡 Illuminance Converter
Convert illuminance (light level) units — lux, foot-candles, kilolux, phot and nox. 1 foot-candle ≈ 10.764 lux; used in lighting design, photography and horticulture.
1 lx = 0.09290304 fc
1 lux = 0.09290304 foot-candles
1 × 0.092903 = 0.09290304
1 lx equals 0.092903 fc, so multiplying by 0.092903 converts the value. The result describes the exact same quantity — only the measuring stick changes.
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All illuminance units
| Unit | Symbol | Definition |
|---|---|---|
| Lux | lx | The SI unit of illuminance — one lumen per square metre. A brightly lit office is about 500 lux; direct sunlight can exceed 100,000 lux. |
| Foot-candle | fc | One lumen per square foot, about 10.764 lux. Common in US and lighting-industry practice; 1 fc is roughly the light of one candle at one foot. |
| Kilolux | klx | One thousand lux — a convenient unit for bright conditions like overcast daylight (about 1–2 klx) or full sun (up to ~100 klx). |
| Phot | ph | The CGS unit of illuminance — one lumen per square centimetre, equal to 10,000 lux. Rarely used today outside older optics literature. |
| Nox | nox | One millilux (0.001 lux) — a historical unit for very low light levels such as those near the threshold of vision. |