💡 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.
Popular illuminance conversions
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. |
Frequently asked questions
How do I convert illuminance units?
Choose your two units in the converter above and type a value, the result updates instantly, entirely in your browser. All 5 illuminance units on this page are interchangeable, so you can convert in either direction.
Which illuminance units can I convert here?
This converter supports 5 illuminance units: Lux (lx), Foot-candle (fc), Kilolux (klx), Phot (ph) and 1 more. Pick any two to convert between them.
What is the most common illuminance conversion?
One of the most-used illuminance conversions is Lux to Foot-candles (lx → fc). Every illuminance pair we support is linked below, each with its own formula and table.
Is this Illuminance Converter free and private?
Yes. It is free with no sign-up, uses the exact internationally defined conversion factors, and computes every result locally in your browser, nothing you type is uploaded, and the page keeps working offline.