Lux [lx] to Foot-candle [ft-cd] Converter
Quick Reference
1 Lux (lx) = 0.0929030436 Foot-candle (ft-cd)
1 Foot-candle (ft-cd) = 10.76391 Lux (lx)
How to Convert Lux to Foot-candle
1 lx = 0.09290304359661128 ft-cd
1 ft-cd = 10.76391 lx
To convert Lux to Foot-candle, divide the value by 10.76391 (equivalently, multiply by 0.0929030436). To convert Foot-candle back to Lux, multiply by 10.76391.
Example: convert 10 lx to ft-cd:
10 lx = 10 x 0.09290304359661128 = 0.9290304359661128 ft-cd
Lux
Definition: Lux (lx) is the SI derived unit of illuminance, measuring luminous flux per unit area. It quantifies the amount of light falling on a surface.
History/origin: The lux is derived from the candela, the SI base unit of luminous intensity, and the square meter. It was developed as a standardized measure of light intensity to provide a consistent way to assess lighting levels.
Current use: Lux is widely used in lighting design, photography, and workplaces to ensure adequate illumination. It is also used in scientific instruments and environmental monitoring to measure light levels.
Foot-candle
Definition: A foot-candle (symbol: ft-cd) is a non-SI unit of illuminance or light intensity. It is defined as the amount of light cast by one candle on a surface one foot away. It is equal to one lumen per square foot.
History/origin: The foot-candle originated from the historical practice of measuring light intensity based on the light emitted by a standard candle. The distance was set at one foot, hence the name foot-candle. It was a common unit before the adoption of SI units.
Current use: While less common than the SI unit lux, foot-candles are still used in some industries, particularly in the United States, for specifying lighting requirements in building codes, photography, and certain scientific applications. It provides a practical and easy-to-understand measure of light intensity for certain contexts.
Lux to Foot-candle Conversion Table
| Lux [lx] | Foot-candle [ft-cd] |
|---|---|
| 1 lx | 0.09290304359661128 ft-cd |
| 2 lx | 0.18580608719322256 ft-cd |
| 5 lx | 0.4645152179830564 ft-cd |
| 10 lx | 0.9290304359661128 ft-cd |
| 20 lx | 1.8580608719322256 ft-cd |
| 50 lx | 4.645152179830564 ft-cd |
| 100 lx | 9.290304359661128 ft-cd |
| 200 lx | 18.580608719322257 ft-cd |
| 500 lx | 46.45152179830564 ft-cd |
| 1000 lx | 92.90304359661128 ft-cd |
Common pairs of Illuminance
Foot-candle