In reply to DaveHK:
I'm deeply suspicious of the Alpkit torches unfortunately. I had a Gamma, and it failed very quickly. Replaced by Alpkit, with no quibbles (so top marks for customer service) but the 2nd one has also randomly stopped working. Among my group of friends, we've counted 5 x alpkit torch failures. Other folk seem to have been more lucky with them and had no problems. The lack of reliability I've experienced with them really put them out of the equation for me. They are very cheap, compared to the big brands, but my experience of them has been that you sacrifice a LOT of quality and reliability for the saving.
That isn't everyone's experience though and I've no doubt they've worked well for others, but personally I won't touch them.
There are other cheap brands out there (Fenix, LED LENSER etc) that cost a bit more, but again seem to have high levels of reliability for folk on more of a budget that I'd recommend first.
Cheers!
Stu