Why not? It's not a lot of work, they serve no purpose while I sleep - well, some people feel they act as a thief deterrent if you program them to go on and off and if someone is up and walking around.
Someone calculated 64kw per year. So, if 100 million homes left on the LEDs that would add up to 6.4 Billion watts. That is about the amount of 2 - 500 Megawatt coal fired power plants that we could shut down. Every little bit helps.
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