I think it had been a great headlight. I have a TK30 and use it with CR123 cells. The light is quite lightweight and I think a headlamp version of it would not be hard to carry. When taking in consider the brightness with my HP10 a "HP30" would be a great and very bright headlight. At least if they could do something about the heatsinking, and avoid a 3minutes limit with highest mode...
Regards, Patric