My take on the whole moonlight thing is that it is something manufacturers supplied because reefers asked for it. Logically there is no need for them. If sunlight can't penetrate water, then surely moonlight could not penetrate more than a couple of inches. They look nice, but make my Royal Gramma act funny, so mine are on very little.
Certainly the Coralife 3/4 watt unit is crap IMHO.
