照明是每单位区域表面上的总发光通量。它以Lux（LX）为单位。
1 fc = 0.001 sb
1 sb = 929.023 fc
例子:
将15 footcandle转换为stilb：
15 fc = 0.016 sb
| footcandle | stilb |
|---|---|
| 0.01 fc | 1.0764e-5 sb |
| 0.1 fc | 0 sb |
| 1 fc | 0.001 sb |
| 2 fc | 0.002 sb |
| 3 fc | 0.003 sb |
| 5 fc | 0.005 sb |
| 10 fc | 0.011 sb |
| 20 fc | 0.022 sb |
| 30 fc | 0.032 sb |
| 40 fc | 0.043 sb |
| 50 fc | 0.054 sb |
| 60 fc | 0.065 sb |
| 70 fc | 0.075 sb |
| 80 fc | 0.086 sb |
| 90 fc | 0.097 sb |
| 100 fc | 0.108 sb |
| 250 fc | 0.269 sb |
| 500 fc | 0.538 sb |
| 750 fc | 0.807 sb |
| 1000 fc | 1.076 sb |
| 10000 fc | 10.764 sb |
| 100000 fc | 107.64 sb |
规则