The 219Bs aren’t strictly 5000K. I’ve never seen one which was quite as warm as a 219A, but they do vary between individual units.
I don’t have a way to measure the exact color temperature, but based on comparing it to other lights with known tint bins, I’d estimate the 219Bs range from about 4600K to 5100K… and that happens to be what I consider ideal, so I consider it an improvement.
Excellent review. Out of curiosity, what size is the tail cap boot, and are there aftermarket boots I can purchase, such as a GITD type by DX and others? First post btw, and because of this review I felt compelled to join the forum. 
The boot is… let’s see. About 13.5mm at the widest part of the base, about 9mm inner diameter at the base, about 6mm tall (base thickness is 1mm), and the outer diameter of the cap is about 11mm.
I’m not aware of any aftermarket boots for this, but that doesn’t mean there aren’t any. It’s definitely smaller than any I’ve personally seen though.
Also, welcome to BLF!
Well, I finally got around to re-ordering a replacement for my original from back in June. I had the light for about a week before the clip gave up on me and it slipped out of my pocket. Definitely my fault for relying on the clip given that I had noticed how soft the metal was, but the clip is no longer an advantage in my mine. The metal is so soft that the clip quickly loosens and bends away from the body rendering it ineffective. For pocket carry, I think I’m going to add a ring and an attachment to my belt so it can’t fall if it slips out of the pocket.
I still really enjoyed the light and I think it’s still one of the better choices on the market (hence, the re-order), but the clip is terrible. Does anyone know how to get feedback directly to L3 Illumination? I didn’t have any luck finding a site for them.
Also, I’d appreciate ideas from anyone with experience on clip metals/performance for a more effective replacement clip.
I’ve heard of a few people making their own custom clips for the L10, but it seemed like a pain. The clip on the L10C is a lot nicer than the original L10 clip, but it sticks out a little to make tailstanding unstable (easy enough to grind it down) and I don’t really care for the L10C’s clicky switch.
I haven’t put much time into the L10 family lately though, too busy with lights which can have their firmware reflashed.
It’s too bad there aren’t many 1xAA lights with easily-accessible reflashable MCUs. I think the relatively new cnqg brass 1xAA light might though, and it’s nearly the same size as a L10, so I’m planning to get a couple and try to mod them.
As for contacting L3 Illumination, it’s a joint effort between SBFlashlights and SupBeam.