There's all sorts of ways to go, such as what the first poster too your question answered. Or you can get one of a couple made for bikes bike lights such as: http://www.rei.com/product/745539 or: http://www.rei.com/product/769616 The PlanetBike light seemed to get better reviews then the Cateye, both are aero minimalist approach to lighting. Do a web search and you could probably find a better deal then REI.