Sunlight supply, maker of the Tek fixtures, makes an all in one retrofit kit. Has the ballast in a barebones housing that has the end caps affixed to it. Reflectors just snap in. Pretty cheap for a 2 bulb. I have 2 of the dual 4 footers for my hood. Still have to buy bulbs at $15-20 a piece, but I think you could do it all for under $150 new.