I'd think T4 is warm and T5 is neutral. It's the High CRI that is subjective, no? Color tint/temperature can be quantified but whether it affords a high CRI "look" depends on the user.
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Posted from my phone.
Actually...
T4 and T5 are flux (brightness) bins, and don't denote a certain color temp. Same with T6 and U2. With Cree's naming system, a letter-number combo means flux bin, and a number-letter combo means a tint bin. For example, I believe the V11R hcri was a T4 7B (but I could be miss remembering). T4 tells the brightness and 7B tells the tint.
From there, several tint bins have the same color temp. Color temp ranges are designated as warm, neutral, or cool (though you are free to disagree with Cree's ranges if you want to). And any color temp can have any CRI, which tells how closely it's spectrum resembles that of a blackbody radiator of that color temp. Isn't that fun?
You can look up what all the bins mean on Cree's datasheets.
The misconception of T4 or T5 meaning a certain tint comes from the fact that not all tint bins are available in every flux bin. If you want a neutral tint bin, the brightest flux bin you can get is a T5. If you want a warm, the highest flux bin you can get is a T4. If you want cool, you can get up to a U2.
I'd link to Cree's XM-L datasheets, but I'm on my phone.
:thumbsup:
Sent from my mobile device. Please excuse brevity and typos.