The 18500 version looks like it will be the perfect size. Can you tell us anything about the driver? I suppose it’s going to be a fet based on the quoted brightness and the price.
With Hank’s incredible attention to detail, these lights will probably be pretty spectacular. He doesn’t just slap together cheap parts; he carefully crafts each item.
CREE are always disappointing in 4000K IMHO…
The only ones I really like are the 3000K 90 CRI XM-L2 and the 2700K 80 CRI XP-G3 from KD
Well, 5000K Nichias are in a sweet spot between high lumens and high CRI I suppose