Originally Posted by
cehowardGS
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I RESPECTFULLY disagree! 
For commuters and riders that do lot of riding in darkness, a helmet light is almost a MUST!! A helmet light does so many things good for the commuters at night time, amd for the mountain bike riders in the dark, that they are too numberous to mention.
I agree. I use a helmet light and it has been great particularly intersections and most especially at roundabouts. The ability to shine a light around irrespective of the attitude of the bike has kep more than one driver (or cyclist) from doing something silly.