Last night I finally realized the true value of the bright headlamp: getting a left-turning driver’s attention. I was using the Princeton Tec Dual 3W LED while riding down a gradual hill in the bike lane. Despite all the lumens I was throwing out and my reflective clothing - a driver turning left from the center turn lane apparently didn’t see me. As he started his turn I grabbed the brakes and looked at him. He hit the brakes and froze like a deer in headlights. He waved apologetically for not seeing me and we both continued on our way. Without the helmet light - I think it would have been a different ending to the story.