I think I figured it out.
It must be a 5500K color temperature.
Digging up some specs from Nichia’s website says:
SM505
x 0.3447
y 0.3553
a 0.005925
b 0.014030
Ø –31.78
Reference

Referencing the MacAdam color space chart with these numbers seems to show it is 5500k If I’m reading it correctly.
I still don’t know what the CRI is though.
Here’s the best I could reference color tints. Sadly there is no sm505 to reference.
