I bought mine through petsmart, they are called Ceramic Infrared Heat Emitters and are sold right with the hot rocks.
http://www.petsmart.com/product/index.jsp?productId=2752658
I just wish they made a 40watt.
I am looking to put mine on a thermostat control so I don't have to worry about...
I found that game birds are very light sensitive. Many people use colored lights so they will sleep... they seem to not rest properly with white light.
I go one step better and it has almost completely ended my losses all together, I use the ceramic reptile bulbs that you can pick up at the pet...