Also, if you are looking for T5's on the cheap and don't care about annoying things like a little bit of buzz in the ballast or push-on sockets, go on ebay, there is a guy on there who sells lots of cheap T5's second hand. I got one from him. It works fine in practical terms, if you're trying to save money. The push-on sockets can be annoying if you need to change bulbs mid run without an easy way to move the plants out of the way.