i’ve got one of these:
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it’s ace.
i got the smooth reflector – so it projects a small bright spot, and some sanyo 2700 mAh Nimh batteries.
(and i’m trying not to be a battery bore, but sanyo make the best batteries, although you can buy other brands, that claim 2800mAh or even higher, if sanyo can’t do it, it can’t be done)
i get about 2 hours on full-beam (180lumens), which is often TOO bright. i get more than 3 hours on the 120lumen setting – which is plenty.
My fenix can be a pain to attach to my helmet, but i find a simple zip-tie does a good job.
problem is, the fenix is about £45, and a set of 4 good-batteries + charger is about £20. Still, it’s the cheapest set-up i’ve seen for a helmet light, that gives enough light, for enough time.
it feels like money well spent when i get cars blowing their horns, or flahing their full-beams at me after i’ve accidentally/temporarily blinded them.
night-riding is ace – it’s a good reason to look forward to winter.