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Application of Rain-X or synthetic wax may help with the headlights depending on the angle of the lights.
LED do in fact produce heat 70% of the power consumption is turned into heat and only 30% light (according to Wikipedia) where as 90% of the power in a standard bulb produces heat. If you are getting the the same light out put from an LED using say 10 watts as a 60 watt bulb that represents a significant reduction in heat output.
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