dont switch to tubes. buy a few 42 watt CFL at home depot or lowes if you're gonna use flouros. build a home made reflector that you can raise/lower and get 4+ of those bulbs on it. works pretty well and is cheap. you have to do some super easy wiring but its worth it. The only thing flouro tubes are good for is starting out seedling to about the second or third node because the plants can touch the tubing and not burn so you can keep your seedlings really short and inspire the plants to bush out.