planet bike blaze 1 watt. $30 shipped on fleabay. The strobe is great (it lights up street signs blocks ahead of me) and I can actually see on the path with the constant light. 2 AA's for a power source. For $55 you can get the head and tail light from the lbs. The superflash trail is also a great light. Go here to take a look http://www.planetbike.com/page/learn/lightfinder...doesn't show the strobe.