They do look very cool, but they can also serve a purpose. Basically the only way they can be useful is if they are timed to the moon itself. The idea is that corals reproduce to the moon cycle... so why not try and help them out. But if it is off it is of no use.
I have seen people use a small blue "party bulb" from the grocery store attached to a dimmer or comupter module that runs it either manually or automatically.
Luke
[ May 07, 2001: Message edited by: Luke ]