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 sb = 929.023 fc
1 fc = 0.001 sb
例子:
将15 stilb转换为footcandle：
15 sb = 13,935.34 fc
| stilb | footcandle |
|---|---|
| 0.01 sb | 9.29 fc |
| 0.1 sb | 92.902 fc |
| 1 sb | 929.023 fc |
| 2 sb | 1,858.045 fc |
| 3 sb | 2,787.068 fc |
| 5 sb | 4,645.113 fc |
| 10 sb | 9,290.227 fc |
| 20 sb | 18,580.453 fc |
| 30 sb | 27,870.68 fc |
| 40 sb | 37,160.907 fc |
| 50 sb | 46,451.133 fc |
| 60 sb | 55,741.36 fc |
| 70 sb | 65,031.587 fc |
| 80 sb | 74,321.813 fc |
| 90 sb | 83,612.04 fc |
| 100 sb | 92,902.267 fc |
| 250 sb | 232,255.667 fc |
| 500 sb | 464,511.334 fc |
| 750 sb | 696,767.001 fc |
| 1000 sb | 929,022.668 fc |
| 10000 sb | 9,290,226.682 fc |
| 100000 sb | 92,902,266.815 fc |
规则