I have a 29 also. I believe I'm in the medium maybe medium low but I've had great growth from almost everything I've tried. All I have is a glass top with 2-24" t-8 lights. Each light has it's own fixture as I couldn't for the life of me find a single 30" fixture that holds two t-8s.
We don't inherit this world from our parents, we borrow it from our children.