I have those LED
night light. I must admit they looks way cool in total darkness. I think it has got something to do with coral spawning.
told me it helps the coral spawning. He mentioned a lot about how coral spawn and how real moonlight helps the spawning of corals in the nature. In the wild coral spawn only spawn at night and there are only certain times coral spawn and this has got something to do with moonlight shining into the water during certain time of the year well too complicated for me to understand.
He stress however no one will want their coral to spawn in their tank that would be total disaster, so I wouldn't recommend anyone to have this moonlight thing for their reef tank, FOWLR
is another story IMO
Is he right or wrong I have no idea though...