We have a 14' x 30' enclosure with a attached A/C & heated room for our tortoises. I am looking for something for a roof for the open area to keep the rain out but clear for the sunlight uva rays to come through. I have researched a little on polycarbonate material that shows to allow 87% of the light to get through. Also, seen that people use it on green houses. Has anyone used this or have a better material they have used?