LED's as in Lunar (Moon) lights. Don;t mean a thing. It will not have any effect on the tank or what is in it. They are merely aesthetics for those on the outside (dry side) looking in, so evidently your not into effects that they provide. Usually on our tanks if the lunar lights are not working there is dire consequences from the wife to get them working again as her favorite time to view the tanks is at night under luanr lights