I purchased one of these before:
http://cgi.ebay.ca/Moontube-Moon-Con...item2305bd28c6
Difference is it automatically dims and brightens to actually simulate the lunar cycle. Kinda cool and you can get as many little LED bars you need for your tank and they come with clips that just use double sided tape.
I'm sure the one you're looking at probably just uses double sided tape as well.