I’ve been looking around on the “Energy Saver” website.
They would have to be testing the lightbulbs that they certify.
That discrepancy between Cree’s 90+ CRI rating and Energy Saver’s 96 CRI rating is interesting.
I wonder if there isn’t some batch to batch color variability in the manufacturing of LED lightbulbs.
These companies are claiming CRIs of 80+ and 90+ etc; the “+” implying that they might actually rate higher.
So I wonder, could the CRIs of the finished bulbs actually vary by as much as 4 or 5 points?
For instance, the Sylvania LED bulb 5000k-100 watt equivalent that I mentioned several posts back is rated by Sylvania as 92+ CRI.
The Energy Saver site however says that the 5000k Sylvania's CRI is 96.
This same style bulb in the 2700k version, while rated by Sylvania as 92+ CRI as well, on the Energy Saver site it’s listed as only 91 CRI.
And the Sylvania bulb in 3000k is supposed to be CRI 92+ too, but tests at CRI 93+ on the Energy Saver website.
So do the warmer white bulbs have lower color accuracy and the cooler ones have higher accuracy? And Sylvania is just calling them all CRI 92+ for marketing convenience? Or in manufacturing does the color accuracy slightly vary from bulb to bulb?