I need to get the proper lighting for my red-footed tortoise. From what I understand it needs a combination of lighting so I was looking at the Zilla combo light fixture which is UVB and a heat emitter and a daylight bulb? Hoping that is okay? But, do I get the lighting to cover the entire closure that the tortoise lives in or should it only cover a portion of the enclosure so they can move in and out of the light? Please advise. I appreciate the assistance.