Foot-candle (fc)
One lumen per square foot: 1 ÷ 0.09290304 lux. Used in US lighting design.
What is a foot-candle?
- Symbol
- fc
- Quantity
- Illumination
- Unit system
- US customary
- Definition
- One lumen per square foot: 1 ÷ 0.09290304 lux. Used in US lighting design.
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
Used in US lighting design, building codes and indoor gardening to state light levels on work surfaces and plants.
Foot-candle in other illumination units
- 1 fc ≈ 10.76391042 lxFoot-candle to Lux converter
- 1 fc ≈ 0.01076391042 klxFoot-candle to Kilolux converter
- 1 fc ≈ 10763.91042 mlxMillilux
- 1 fc ≈ 0.001076391042 phPhot
Foot-candle quick reference
| Foot-candle | Lux | Kilolux | Millilux |
|---|---|---|---|
| 1 fc | ≈ 10.76391042 lx | ≈ 0.01076391042 klx | ≈ 10763.91042 mlx |
| 10 fc | ≈ 107.6391042 lx | ≈ 0.1076391042 klx | ≈ 107639.1042 mlx |
| 100 fc | ≈ 1076.391042 lx | ≈ 1.076391042 klx | ≈ 1076391.042 mlx |
| 1000 fc | ≈ 10763.91042 lx | ≈ 10.76391042 klx | ≈ 10763910.42 mlx |
Where the foot-candle fits
The next smaller illumination unit is the lux (lx). 1 fc ≈ 10.76391042 lx, and 1 lx = 0.09290304 fc.
The next larger illumination unit is the kilolux (klx). 1 fc ≈ 0.01076391042 klx, and 1 klx = 92.90304 fc.
Frequently asked questions
- How many lux are in one foot-candle?
- One foot-candle ≈ 10.76391042 lx (lux).
- How many kilolux are in one foot-candle?
- One foot-candle ≈ 0.01076391042 klx (kilolux).
- How many millilux are in one foot-candle?
- One foot-candle ≈ 10763.91042 mlx (millilux).