Originally Posted by wphamilton

OP [MENTION=411791]topslop1[/MENTION] didn't really ask how to use a helmet light or whether it's a good idea, and I'd give him the benefit of the doubt on not annoying drivers and other cyclists. So, what's a good light for the helmet?

Personally I'd advise to not go overboard with it. Super-bright lights need to be on the bike aimed down at the road, and helmet lights are good for being seen in traffic and lighting up the road/path otherwise. Therefore, just a generic 18650 LED mag light. I don't worry about the mounting either, in fact I throw those straps away or banish them to a drawer, and instead put a patch of Velcro on top of the helmet and on the light. You might be tempted to scoff at that, but I've never had it slip out of position let alone come off and it's not going to be a problem in a crash if that's a concern. I can put it on while riding without skipping a beat, having it aimed exactly how I want,
take it off in a second and nothing is left on the helmet but a discrete patch of velcro. Given that I ride in a more road-race position than sitting up, I can easily put in on the back of the helmet so that it's aimed right while riding, but up in the air when I'm stopped, which takes some kind of elaborate swiveling mount otherwise. Pretty much the ideal mount IMO.