Foot-candle [ft-cd] to Lux [lx] Converter
Quick Reference
1 Foot-candle (ft-cd) = 10.76391 Lux (lx)
1 Lux (lx) = 0.0929030436 Foot-candle (ft-cd)
How to Convert Foot-candle to Lux
1 ft-cd = 10.76391 lx
1 lx = 0.09290304359661128 ft-cd
To convert Foot-candle to Lux, multiply the value by 10.76391. To convert Lux back to Foot-candle, divide by 10.76391.
Example: convert 10 ft-cd to lx:
10 ft-cd = 10 x 10.76391 = 107.63909999999998 lx
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
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 to Lux Conversion Table
| Foot-candle [ft-cd] | Lux [lx] |
|---|---|
| 1 ft-cd | 10.76391 lx |
| 2 ft-cd | 21.52782 lx |
| 5 ft-cd | 53.81954999999999 lx |
| 10 ft-cd | 107.63909999999998 lx |
| 20 ft-cd | 215.27819999999997 lx |
| 50 ft-cd | 538.1954999999999 lx |
| 100 ft-cd | 1076.3909999999998 lx |
| 200 ft-cd | 2152.7819999999997 lx |
| 500 ft-cd | 5381.955 lx |
| 1000 ft-cd | 10763.91 lx |
Common pairs of Illuminance
Foot-candle