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 II = 0 sb
1 sb = 10,000 II
例子:
将15 照明指数转换为stilb：
15 II = 0.002 sb
| 照明指数 | stilb |
|---|---|
| 0.01 II | 1.0000e-6 sb |
| 0.1 II | 1.0000e-5 sb |
| 1 II | 0 sb |
| 2 II | 0 sb |
| 3 II | 0 sb |
| 5 II | 0.001 sb |
| 10 II | 0.001 sb |
| 20 II | 0.002 sb |
| 30 II | 0.003 sb |
| 40 II | 0.004 sb |
| 50 II | 0.005 sb |
| 60 II | 0.006 sb |
| 70 II | 0.007 sb |
| 80 II | 0.008 sb |
| 90 II | 0.009 sb |
| 100 II | 0.01 sb |
| 250 II | 0.025 sb |
| 500 II | 0.05 sb |
| 750 II | 0.075 sb |
| 1000 II | 0.1 sb |
| 10000 II | 1 sb |
| 100000 II | 10 sb |
规则