Originally Posted by
Monster Pete
If you're wearing a helmet, I'm not sure that mounting lights etc to it is such a good idea. Anything external to it could impede the helmet's ability to do its job, and also add extra leverage in an oblique impact. In any case, what's wrong with mounting lights to the handlebars? Every other road vehicle mounts its lights to the vehicle rather than the driver...
It's not really a problem. I've crashed with helmet lights mounted and smacked my helmet. The light mount broke but the helmet did it's job.
As for mounting the light on your head, it's an advantage. It's not just to get the attention of drivers but it also helps you see
into corners and avoid obstacles. Some cars are now coming with lights that track the corner rather then just shine off in a straight line.