Originally Posted by
cyccommute
I'm not sure which Serfas Thunderbolt you are talking about.
This Serfas Thunderbolt has 15 micro LEDs but I wouldn't call it a "helmet" light. At least not for the kind of application that Chris516 and many others want a helmet light to do. This might be a good "be seen" light but I doubt that it would work very well as a light to illuminate the road to avoid road obstacles. For that most people want a brighter light with a more coherent beam.
The twin rubber straps are very versatile and my whole faamily uses these strapped horizontally to the rear helmet adjusting strap. This positions it very nicely to shine relatively straight back and illuminate your torso from the rear.
And I just realized you guys are talking about a helmet mounted headlight. I thought you were looking for a helmet mounted tail light. My bad! I should have checked the link first before responding.
Well if you are looking for a helmet tail light, check this one out...