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.