This info can be found elsewhere but I thought I'd sticky it. I've talked to quite a few people that hadn't realized I have these options so here ya go!
The 4000K MCE is available in limited quantities. I only order about 10 at a time so (on occasion) I'm out of stock. Please email me if you have questions.
Cree MCE (MC18-B) (LED options: 6500K "N-Bin" (+$10), 6500K cool, 4500K neutral)
Cree XML (XM18-B) (LED options: U2 6500K cool, T5 00K neutral)(Limited number of 20 degree TIR optics available...inquire)
Cree XPG High CRI (93+) (XP18-B) This is pretty self explanatory...(3000K warm) Driven @ 1.4A so you will get LOTS of run time with an 18650.
Cree XRE (XR18-B) I also have this XRE-R2 (6500K) option. (not listed on my site) This is a good choice if you want 200+ lumens and 3+ hours of run time on high. This is driven @ 1.4A instead of 2.8A.