| 标准光源 | 定义 |
| A |
Artificial illuminant such as a tungsten lamp at a color temperature of 2880°K |
| B | Noon sunlight at 4874° K |
| C | Average daylight (overcast sky) at 6774° K |
| D50 | Typical bright daylight (overcast sky) at 5000° K |
| D55 | Typical bright daylight (overcast sky) at 5500° K |
| D65 | Typical bright daylight (overcast sky) at 6500° K |
| D75 | Typical bright daylight (overcast sky) at 7500° K |
| F2 | Cool white fluorescent lamp at 4200° K |
