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 lm/cm² = 10,000 br
1 br = 0 lm/cm²
例子:
将15 每平方厘米的管腔转换为亮度：
15 lm/cm² = 150,000 br
| 每平方厘米的管腔 | 亮度 |
|---|---|
| 0.01 lm/cm² | 100 br |
| 0.1 lm/cm² | 1,000 br |
| 1 lm/cm² | 10,000 br |
| 2 lm/cm² | 20,000 br |
| 3 lm/cm² | 30,000 br |
| 5 lm/cm² | 50,000 br |
| 10 lm/cm² | 100,000 br |
| 20 lm/cm² | 200,000 br |
| 30 lm/cm² | 300,000 br |
| 40 lm/cm² | 400,000 br |
| 50 lm/cm² | 500,000 br |
| 60 lm/cm² | 600,000 br |
| 70 lm/cm² | 700,000 br |
| 80 lm/cm² | 800,000 br |
| 90 lm/cm² | 900,000 br |
| 100 lm/cm² | 1,000,000 br |
| 250 lm/cm² | 2,500,000 br |
| 500 lm/cm² | 5,000,000 br |
| 750 lm/cm² | 7,500,000 br |
| 1000 lm/cm² | 10,000,000 br |
| 10000 lm/cm² | 100,000,000 br |
| 100000 lm/cm² | 1,000,000,000 br |
规则