I have three bikes. I have front and rear 180-degree flashers on each bike, and a Niterider 500 that clamps onto the handlebars of whatever I'm riding. A couple of years ago I added an amber flasher to the rear of my helmet, and a 7-LED flashlight to the front. I added the helmet lights to help me be seen above hoods, trunks and lower cars. And to be able to aim a light at cars coming from the sides. When I was researching what to get and if I wanted my main light on my helmet, one poster mentioned that having a super bright light on his helmet made it difficult to read his gagues when it was dark because it was too bright.