| 定義 | |
| 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 |