In actual road tests, I have found that cheapo LED blue-white headlights work great. I had several friends check me from their cars, and also asked a cop who had just passed me, then pulled into a parking lot. All said they saw me just fine on a well lit city street. The light I was using was a Planet Bike LED that uses 4 AA batteries and cost about $35.00. The batteries run more than 20 hours, so it is also economical and easy to operate. It does not work very well for seeing, however.