Morgan

My new tank did not come with a hood. Due to how expensive hoods are for my 47 g tank, my dad is rigging up a hood for me with a discarded window screen. There will be no lighting hooked up to it. But how about using something like those moonlight gadgets. But I'm not sure if they're hooked up inside or outside the tank. Are there any lights that can go inside the tank?

Nutter

I assume you mean under the water line? If so the only thing I am aware of are LED spotlights. There could be other things though. I'm not exactly spoiled for choice when it comes to aquariums or accesories here in Perth.
You would be better off building your own hood with flouro light fittings though. Especially if you want to grow plants at all as those LED's just won't cut it.