I'm new to this and only considering getting a horsefield tortoise, but first I want to know all that I can know instead of asking when I actually have the tortoise, I've spent the last couple of days researching the right enclosure, lighting etc. I've decided I want to get the solar glo heat/uva bulb instead of 2 separate and I want the exo terra bulb holder (do I need small, medium or large)? The large aparently can hold up to a 200w bulb, so what size wattage bulb do I need? I know it's probaly difficult to tell but as a guide what should I use? What's the difference? Sorry there will probably be alot of questions coming over the next couple of weeks, I'm hoping to slowly have everything before I actually get a tortoise, and be familiar with all the equipment so that I know what I am doing and create little stress as possible moving it in!