Mirror

[Canadian]

Adam, "they" make them. Lighting tracks of the type you describe are used in hydroponics and they have been used in reef aquarium applications as well. The inherent problems with them are: huge cost, size, and the potential for any mechanized device like that to seize up when mounted in close proximity to the evaporated water coming from an aquarium (among other things).

But if you're really interested in implementing the idea take a look on RC and reefs.org; there have been a few people with "high end" set ups who have incorporated that kind of an idea into their setups.