I stocked up on some 100-watt incandescent bulbs before they disappeared from the store shelves. Now I just use 60-watt incandescents for the heat. That will give them any light they need, too. Once they get old enough to where they don't need as much heat, then I use LED bulbs. However, by that time, they may not need a constant light source, too, so it just depends on what I wanted to do (eg some times I got home late and I would still like them to eat a little bit before calling it a night, so I leave the light on for a bit)