the moon is already bright (Score 1)

If you ever go out on a hike at night with a full moon, it is pretty bright, it lights up enough so you can see where you are going. so imagine having 2 times the brightness eh!? I am sure there would be enviromental impacts on nature. creatures that are really sensitive to light probably will get die out or something messed up like that. but in a business point of view, this billboard idea isn't plosible because the majority of mass consumers are not stuck in cages called motorised vihicles with roofs that they won't realise what is in the sky.