alt Hacker NewsNot to mention the Color Rendering Index (CRI) metric Ra does not weigh the R9 (deep red) so many forms of lighting don't try to render it correctly to save costs.
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ksec • yesterday at 9:16 PM
Ugh. CRI doesn't include R9, so CRI 100 doesn't mean 100% replicating sun light / Incandescent Light bulb? Are there any LED that actually does a decent job in colour representation?
This is truly an (accidental?) setback of color reproduction as it has progressed over time. For LED lights R9 is also crucial for skin tones which makes it so bad to just leave that out. Now, the mass produced LEDs are even optimized for CRI at all are virtually all excluding R9, which may be one of the main quality issues that many people perceive with LEDs vs eg incandescent. There’s of course more to it but R9 probably has a disproportionate effect for being a ”minor detail”.