I'm buying a few leds from
Autolumination for a non-aquaria project, but I've noticed that a few people on RC use them for moonlights and seem to be happy with them. All you need to do is buy a 12v AC/DC adapter, solder it together and plug it in. If anyone wants to piggy back a few led fixtures with my order, let me know asap. All prices are in USD.
-Rich