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 = 0.0929030436 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 = 107.6391 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 | 53.81955 lx |
| 10 ft-cd | 107.6391 lx |
| 20 ft-cd | 215.2782 lx |
| 50 ft-cd | 538.1955 lx |
| 100 ft-cd | 1076.391 lx |
| 200 ft-cd | 2152.782 lx |
| 500 ft-cd | 5381.955 lx |
| 1000 ft-cd | 10763.91 lx |
Common Foot-candle to Lux conversions
- 1 ft-cd = 10.76391 lx
- 2 ft-cd = 21.52782 lx
- 3 ft-cd = 32.29173 lx
- 4 ft-cd = 43.05564 lx
- 5 ft-cd = 53.81955 lx
- 6 ft-cd = 64.58346 lx
- 7 ft-cd = 75.34737 lx
- 8 ft-cd = 86.11128 lx
- 9 ft-cd = 96.87519 lx
- 10 ft-cd = 107.6391 lx
- 12 ft-cd = 129.16692 lx
- 15 ft-cd = 161.45865 lx
- 20 ft-cd = 215.2782 lx
- 25 ft-cd = 269.09775 lx
- 30 ft-cd = 322.9173 lx
- 40 ft-cd = 430.5564 lx
- 50 ft-cd = 538.1955 lx
- 60 ft-cd = 645.8346 lx
- 75 ft-cd = 807.29325 lx
- 100 ft-cd = 1,076.391 lx
- 150 ft-cd = 1,614.5865 lx
- 200 ft-cd = 2,152.782 lx
- 250 ft-cd = 2,690.9775 lx
- 300 ft-cd = 3,229.173 lx
- 500 ft-cd = 5,381.955 lx
- 750 ft-cd = 8,072.9325 lx
- 1,000 ft-cd = 10,763.91 lx
Common pairs of Illuminance
Foot-candle