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What other parameters can be used to evaluate the colour quality of light?

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.