Colour variation in lighting is known as “colour temperature” and is measured in degrees Kelvin. The colour temperature scale ranges from at one extreme a candle flame (approximately 1,900K) to a deep blue sky (approximately 10,000k). The chart below illustrates a number of key lamp types and where they appear on the colour temperature spectrum.
| Colour Reference | Colour | Colour Temperature | CR1 Ra |
| Colour 827 | Very Warm Triphosphor | 2700 | 85 |
| Colour 830 | Warm White Triphosphor | 3000 | 85 |
| Colour 835 | White Triphosphor | 3500 | 85 |
| Colour 840 | Cool White Triphosphor | 4000 | 85 |
| Colour 865 | Daylight Triphosphor | 6500 | 85 |