I have one of the triple LED (white) lights on both my 70 and my 90. If you really want to see the whole tank well, then maybe two would do better. If the inside of the light hood is painted white, then pointed up into the hood provides a nice even light.

http://autolumination.com/fixtures.htm (Scroll down)

They are made to run on 12 volt DC so a small wallwart is needed. The sticky back thing doesn't really work well, so plan on a different way to mount them. They are all-plastic, including the 'silver' ring.

TW