I have the Zebra Light H600Fw Mk IV 18650 XHP35 Floody Neutral White headlamp.
I tend to avoid the brightest setting because it heats up a lot, but it's very bright. The reason I got it was because we got asshole'd coming off a ridge in Idaho at night last Oct. It was steep and thick and I really wanted a light that I could see much further to pick a better line. It took some googling/research to find the batteries, and I ended up ordering 2 18650s and a charger from IMRbatteries.com. The protected circuit is not needed on the battery as it probably won't turn on due to the added length of the battery, and the Zebra light has a protection circuit already. I ended up cutting off the protection circuit of the batteries I ordered.