I'm going to try my hand at indoor vegetable gardening during the winter months. I have a T12, 40W fluorescent grow light that I want to convert to T5. I hope to use both 3000k and 6500k lamps. The local power company tells me that I can accomplish the conversion by replacing the current ballast with an electronic ballast. There are so many ballasts out there that I feel like a babe in the woods. Can anyone tell me exactly which one I need? Also, are the smaller T5 lamps going to fit my fixture?