My favorite light wish? An HDS on 1x18650!!!!!!!!!!! I love my 170t clicky, and I have a 17670 tube for it, but it would just be plain AWESOME if Henry would make some 18650 tubes, not only for the new versions, but for the previous versions as well. 18650 has become my favorite format. The light is typically not TOO long, and you get the higher voltage over primaries, plus the super nice runtime in a light like the HDS that doesn't suck current like there's no tomorrow. I think the compactness of the HDS with 1xCR123 is what makes them so attractive for a lot of folks, but there's also a lot of folks that like the runtime afforded by todays higher capacity 18650's. I'll keep on dreaming of one I guess!