I have a PVC cage from Constrictors NW and I use an LED light strip I got off of amazon. It has lots of different colors controlled by a remote and it doesn't produce much heat at all. The only down side was the adhesive backing that it comes with. The 3M adhesive isn't well suited for that environment and could be hazardous to the snake. I used hot glue along the sides and it has held firm for about 6 months now.