Very bright even on sunny days! Consumes very little power, so the car can be idle for a long time when using the light. The magnets are very strong, contrary to other reviews I've read. The reason for the rating of 4 is that the power cord is TOO short! (for use in Chevrolet Trailblazer) Had to purchase an 8ft extension from Radio Shack to keep the cable from being pulled across the passenger's chest.
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