I've got a Petzl Tikka Xp on the front of my helmet. It has a hi/lo steady mode, a steady/flashing red LED and and a VERY BRIGHT white strobe mode. It also has a diffuser lens that can slide over the LED lens. Set on strobe with the diffuser up a very wide angle strobe is visible from far away. Sometimes I ride with that facing forward during the day when in traffic. At night I'll have the light facing upward so it doesn't blind others but I can see the reflection in signs 100' away. It's a very good strobe light.