Energy efficient traffic lights seem like one of the best ways to save local governments significant amounts of money of the course of 5, 10, or more years. The lights which often use LED technology are much less demanding on the power grid which in turn means more money for other things. But there’s one side effect many have overlooked. Heat output. Remember, the higher the heat output of a light, the more energy is being wasted. That’s all fie and dandy...