My snake room gets pretty good natural lighting so I don't provide any additional light source. I use UTH's, CHE's and RHPs for my carpets and they'll all work well when properly regulated with a thermostat or dimmer. I think RHPs are the best heat source for carpets especially in a pvc enclosure. I give my carpets a hot spot of 86-90 and an ambient temp of 78-84 during the summer months and a few degrees cooler in the fall and winter. If you have a good thermal gradient the snake will go back and forth as it sees fit. I have a few carpets that like to be close to their heat source and others that only use them when they're digesting or shedding.