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 cd/m² = 1.0570e-16 ly
1 ly = 9,461,000,000,000,000 cd/m²
例子:
将15 每平方米烛台转换为光明年：
15 cd/m² = 1.5855e-15 ly
| 每平方米烛台 | 光明年 |
|---|---|
| 0.01 cd/m² | 1.0570e-18 ly |
| 0.1 cd/m² | 1.0570e-17 ly |
| 1 cd/m² | 1.0570e-16 ly |
| 2 cd/m² | 2.1139e-16 ly |
| 3 cd/m² | 3.1709e-16 ly |
| 5 cd/m² | 5.2849e-16 ly |
| 10 cd/m² | 1.0570e-15 ly |
| 20 cd/m² | 2.1139e-15 ly |
| 30 cd/m² | 3.1709e-15 ly |
| 40 cd/m² | 4.2279e-15 ly |
| 50 cd/m² | 5.2849e-15 ly |
| 60 cd/m² | 6.3418e-15 ly |
| 70 cd/m² | 7.3988e-15 ly |
| 80 cd/m² | 8.4558e-15 ly |
| 90 cd/m² | 9.5127e-15 ly |
| 100 cd/m² | 1.0570e-14 ly |
| 250 cd/m² | 2.6424e-14 ly |
| 500 cd/m² | 5.2849e-14 ly |
| 750 cd/m² | 7.9273e-14 ly |
| 1000 cd/m² | 1.0570e-13 ly |
| 10000 cd/m² | 1.0570e-12 ly |
| 100000 cd/m² | 1.0570e-11 ly |
规则