The Helmet thread is mostly a discussion about whether or not bicycle helmets are useful and/or worth it. This discussion has been going on (in various reincarnations) for at least a decade on the bike forums, and I think "Helmets Cramp My Style" was the first real predecessor of this ***The Helmet Thread*** When I said "on the bike forums" it's more accurate to say "quarantined in it's own thread to keep it away from the Bike Forums" which is a hint at the toxic nature of the discussion. So if I were you, I would take a moment to marvel at the grotesque beauty if this eternal flame war and then GTFO before it sucks you in and spews you out.

When using a helmet, just keep in mind that it's a very limited means of protection, (In my opinion to the point it's not worth wearing one) and that real bicycle safety comes from avoiding accidents altogether. As for mounting lights etc to a helmet: just don't. It adds unnecessary weight and protrusions to the helmet, which can exacerbate and even cause injuries in case of an accident. On top of that it will probably compromise the already weak design of the helmet. It's better to mount lights etc. onto the bike.