This sounds exactly like what I purchased last weekend. I bought a Photon Freedom microlight in Red as well as NV green ($11 each). Both are extremely light weight and come with a quick detach snap link as well as a hat clip for hands free use if you don't want to use your teeth.
They have user adjusted variable intensity LEDs or can be used with a simple click for quick on/off at full brightness. They also strobe at several different preset strobe settings: slow(5s), fast (2s), SOS strobe, morse code setting.
They are also made in IR, white, etc upon request. Handy little things!
