Portland Design Works raises the brightness bar with the PDW Radbot 1000 Rear Bike Light but using a Nichia 1.0 watt LED that's more commonly used in the tail lights of automobiles. Combined with a Euro-style reflector that concentrates the light, the Radbot 1000 gives you an extra visibility edge when drivers approach you from the rear. Get one of these and see for yourself; there's no such thing as too much visibility when you're riding your bike.