Apart from CRI, R-values and CQS, colour consistency is also a measure of the quality of light. The colour consistency can be evaluated at several levels as follows:
- Consistency over time: Colour shifts over the life time of LEDs.
- Consistency between different products and batches: Colour tone variations from batch to batch.
- Consistency across the beam of light: colour shift across the beam of the LEDs.
- Consistency between colour specification in the datasheet and that seen when the LED is used.