Just got back from testing the Planet Bike Blaze 2W light. I have it mounted on the side my Tubus low-rider rack, and it's positioned so that the beam augments my main headlight (dynamo-driven IQ Cyo R). The Blaze's beam is on the tight/narrow side, so positioning it took a few more attempts than, say, a Dinotte would require. But with the Blaze on the low setting, it puts out enough light to make a difference in how well I can see what's almost directly in front of my wheel.