With multiple mounting options that you can quickly change, the Princeton Tec Snap LED Headlamp is a light that lives up to its name.
A single Maxbright white LED outputs a maximum of 200 lumens to light your way, with an ultra-low dim setting to read by without disturbing your bunk mates plus a flashing strobe mode that makes you highly visible if you're biking or walking on the road. A simple push button gives you control of the output and three included AAA alkaline batteries drive the LED—or you can use your own rechargeable NiCad or NiMH if you'd prefer, but output and runtimes might be different.
In addition to a head strap and headlight mount, you also get a handlebar mount for your bike, a magnetic mount that allows you to stick the light to a car hood or other metal surfaces, and a loop mount and a carabiner so you can hang the light from just about anywhere. Each of the different modular mounting options install on the light in a (figurative) snap with a (literal) snap, and are held in place by a magnet. Its plastic housing is IPX4-rated to be resistant against light rain or splashing water, and since it weighs just 3.5 ounces you can wear the Snap all day without it causing neck strain.