I just bought the Planet Bike upper end duo for about $61 and I'm amazed at how bright they are. The guy at the lbs said they were all blown away buy the quality of the light for just a couple of batteries. I actually turned on my light the first night I had it, set it on a parked car on the street and rode my bike away then back toward it just to make sure it could easily be seen and It was blinding. Unless you are commuting and riding in the dark a lot I don't think you need to buy one of the expensive lights.