Im building a new cage for my green tree monitor and I want to upgrade the uvb lighting. I'm currently using the kind you just screw into a socket but I've read they are not ideal. It's heated with 65w flood lights and a ceramic heater but the cage doesn't get exposed to much sunlight. I want to upgrade to the tube lights probably from reptisun or equivalent. The enclosure will be roughly 4ft long so should I go with a 4ft or 2ft bulb? Also what should I use for the fixture? It will either hang or be mounted at the top. I'm terrible with figuring out electrical compatability. Can I get a fixture from a hardware store or will I need to buy a reptile specific fixture?