I have a couple that just slide on to a hat brim, I thought those were perfect, then I got a hat from Lowe's that has lights built right into the hat brim, that was so much brighter, the only thing is all these use watch batteries, so they all are just sitting and doing nothing.. I bought a few months ago a keychain, it uses a watch battery but it's rechargeable, I must say, it's very lightweight and much brighter, I even wrote to the manufacture giving them the idea that they need to come up with a adapter or a upgrade version of the light so that you can use it as a headlamp cause that would be perfect! They did come up with an upgrade but not for what I wanted, I forget what it's called, but I think it's from niteize?
JR
I take that back, it's by nitecore, and sure enough they have a new product which has a clip!