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 = 1 ph
1 ph = 1 lm/cm²
例子:
将15 每平方厘米的管腔转换为光：
15 lm/cm² = 15 ph
| 每平方厘米的管腔 | 光 |
|---|---|
| 0.01 lm/cm² | 0.01 ph |
| 0.1 lm/cm² | 0.1 ph |
| 1 lm/cm² | 1 ph |
| 2 lm/cm² | 2 ph |
| 3 lm/cm² | 3 ph |
| 5 lm/cm² | 5 ph |
| 10 lm/cm² | 10 ph |
| 20 lm/cm² | 20 ph |
| 30 lm/cm² | 30 ph |
| 40 lm/cm² | 40 ph |
| 50 lm/cm² | 50 ph |
| 60 lm/cm² | 60 ph |
| 70 lm/cm² | 70 ph |
| 80 lm/cm² | 80 ph |
| 90 lm/cm² | 90 ph |
| 100 lm/cm² | 100 ph |
| 250 lm/cm² | 250 ph |
| 500 lm/cm² | 500 ph |
| 750 lm/cm² | 750 ph |
| 1000 lm/cm² | 1,000 ph |
| 10000 lm/cm² | 10,000 ph |
| 100000 lm/cm² | 100,000 ph |
规则