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)
Nichia 219 High CRI (92+ CRI) (NC18-B) This is pretty self explanatory...(4500K neutral)