I was wondering if someone could give me some quick advice on low voltage lighting cable? I happen to be opening a trench to the back of my property and I thought that I'd burry some low voltage cable to uplight some large oak trees in the future while the ground is opened. The distance to the last fixture will be about 200 feet. There will be 3 or 4 fixtures about 25 feet apart at the end of the cable. I just want to burry the cable now while the ground is opened. What size cable should I use and what is a good type of fixture for this type of treatment?