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 fc = 10.764 br
1 br = 0.093 fc
例子:
将15 footcandle转换为亮度：
15 fc = 161.46 br
| footcandle | 亮度 |
|---|---|
| 0.01 fc | 0.108 br |
| 0.1 fc | 1.076 br |
| 1 fc | 10.764 br |
| 2 fc | 21.528 br |
| 3 fc | 32.292 br |
| 5 fc | 53.82 br |
| 10 fc | 107.64 br |
| 20 fc | 215.28 br |
| 30 fc | 322.92 br |
| 40 fc | 430.56 br |
| 50 fc | 538.2 br |
| 60 fc | 645.84 br |
| 70 fc | 753.48 br |
| 80 fc | 861.12 br |
| 90 fc | 968.76 br |
| 100 fc | 1,076.4 br |
| 250 fc | 2,691 br |
| 500 fc | 5,382 br |
| 750 fc | 8,073 br |
| 1000 fc | 10,764 br |
| 10000 fc | 107,640 br |
| 100000 fc | 1,076,400 br |
规则