Here's a pic:
I just bought this Moonlight w/Lunar Phase Controller from Fishbowl Innovations. I ended up getting a pretty good deal by purchasing it from them off of eBAY. The LEDs are setup to create a wide angle light spread so you don't get that spotlight effect you see with some DIY
setups. The LED
color is blue to simulate the moon's wavelengths.
I bought this one, rather than making my own, because of the wide angle aspect and especially because of the Lunar Controller. It's basically a dimmer on a timer that is timed based upon the actual duration of the lunar cycle over the 29.5 day period. I've been trying to simulate a natural enviorment for my archerfish so even though they don't need the moonlight, let alone a cycle, I thought maybe they'd enjoy it. Archers are wild caught so I know they've spent time in the wild. They know what it's like so I feel it's only fair to try to simulate it for them.
Archers don't seem to have any exciting nocturnal habits. At night they typically go into safe places and sleep. They also tend to turn a dark color that camoflauges them very well. It still worries me that maybe they're turning dark because they're not feeling well but when I spark up the lights they end up going back to their normal colors... it's pretty interesting. I've been looking around and haven't found any documentation on this behavior yet.
Anyways, just making a short story long. I recommend this product if you can get it at a good deal. It's $80 shipped from Fishbowl Innovation's website, or if you get one of their eBAY auctions I got mine for $50 shipped. The product is very high quality and I'm 100% satisfied.