I can say that I had the 20 Lumen knog blinder. I thought it was super bright, until two weeks ago. I was hit by a truck on a morning ride, carbon frame is spent according to Scott, and so is my clavicle according to the ER and X-rays. The kicker is that the driver is also a cyclist and didn't see me. Granted I was riding into the sun, but that's when you need a bright light the most.

When im released to get back on the bike (and the driver's insurance gives me a check to get a new bike), I'll be adding the quad red fore every ride.