R9: More Important than CRI?

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Like flicker, color is a widely-debated and often misunderstood topic among the lighting industry. In the past few years, we have seen the following changes regarding color:

  • TM-30-15, a new color metric from the Illuminating Engineering Society
  • California Title 24’s minimum 90 CRI requirement for residential buildings
  • A minimum R9 of 50 as an optimization for the WELL Building Standard and a requirement for residential lighting under Title 24

Read more…

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