I have always wondered how they change the lights on the giant radio and cell phone towers with the red lights. I did some research a while back and the only way to explain it is to show this video. Enjoy.
https://www.youtube.com/watch?v=yCYZZPwJr_c&feature=BFa&list=FLaR8wwQhGGkjybFA7ojhm3w
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