I know everyone is having sticker shock about the Dinotte but it really is a nice helmet light. This is a 5W Dinotte that I always have attached to my helmet. I run it in the flash mode (6 flashes, 1 second pause, 6 flashes) and with a good set of batteries I've usually managed to catch people's attention including drivers and pedestrians that look like they're about to step out into traffic against the light.