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Apologies if it's already been done, about to start night riding...quite happy with my magicshine lights but could do with something else on my lid. Any cheapies out there, it's a minefield on evilbay IMO lol... Ta
I recently got a BT21 from Gearbest for £40 works well as a helmet light.
http://m.gearbest.com/led-flashlights/pp_180344.html
I use a cheap and abundant Chinese Ultrafire light on all three of my bikes. Works well after doing the slight mods shown here -
The brackets (though clunky looking) work well on handlebars but don't work on helmets. If you can find a helmet bracket that takes a light with an external diameter of 25mm then that should work.
+1 for Gearbest, they do a Yinding cree light, good battery life and just like a glowworm.