I don't know if you got the same brand I linked to (Westek), but they're very bright and haven't corroded at all. Just putting them along the back will light up the whole cabinet. You don't need to go along the sides with these.
Right now I've had 1 bar (20 inches) under my 93 cube (30 inches long) for 2 years and it's still as bright as when I bought it. I made sure to recently buy 3 more for my 180 gallon that's in the works. That little wire links them all together so you only need the 1 power cord for multiple units. It's a huge help to just flick a switch OUTSIDE the cabinet and your whole stand lights up for maintenance and you don't have to worry about growing micro algae from it and zero heat. Glad I could help.
The only thing I've ever wondered about is if you screw multiple things into the stand, if it'll make the tank unlevel or compromise the stands integrity at all. I think I may use velcro when putting these lights in my new tanks stand. They weigh almost nothing so velcro will definitely hold them up if you didn't want to put holes in the stand