I made a simple LED light for my ATS. I used 2 reds and 1 white led to light my screen that is about 4" x 8", and it works very well. Luckily, I had leftover parts on hand from previous DIY builds.
Reef Breeders has a goose neck fuge light that would probably work very well in your setup. I don't have any experience with it, have only seen pictures.