Attaching lights to helmets is so well accepted that one can buy helmet mounting kits for them. They are manufactured. It is also not as if I'm buying a device of monstrous power that is sure to drop a motorist dead with one press of the button. These lights are commonly sold in bike shops -- that is where I got mine -- and is one of the lower power models, actually. I think the rated output is 310 lumens. More expensive models go up to 1700.
I've seen the safety benefits of them for the cyclists. Meaning me. I'm not worried about motor vehicle drivers. I've used a Nite Rider headlight in the distant past -- I don't think that model was an LED one, and the battery pack weighed a ton. I've never yet caused an accident, and no motorist has informed me that s/he was blinded by my headlight. Remember, someone in a vehicle can easily overtake me, cut me off, and give me a lecture. So could a cruising police officer, and this area has loads of police officers on duty. No one has pulled me over yet. If this happens, I will be quite certain to listen carefully to the offended motorist, or the ticketing police officer, and make adjustments forthwith.
A much bigger issue is that someone coming head on to me from the front, is not going to notice me unless I have some form of strobing light. The other driver very well could be blinded by his cell phone and addiction to texting while driving. Terribly dangerous for the motor vehicle driver -- and for me. A strobing pulsing light is just the ticket.
So that is precisely what I've done. Ordered a helmet mounting kit.
I really only wanted to seek out better ways to temporarily but firmly attach the light to my helmet without spending $13.95.
Bob