[Damon]

You have a cpl of options. You could get a 24inch power compact fixture and bulb. This will give you 36 watts of light for 3.6wpg. You could purchase a dual bulb fixture allowing you to place 2 15 watt fluorescent bulbs over your tank for 30 watts (3.0wpg). You could build a DIY fixture and put as much or as little as you want (1-4 bulbs over a 10 gallon tank). Or you could order a retrofit kit from www.ahsupply.com which gives you 36 watts of power compact over your tank. The prices will be about equal give or take a few dollars. I now prefer standard fluorescent over power compacts when they can give ample wattage because the bulbs spread better over a tank vs the powr compacts which penetrate deeper and run cooler but leave dark spots over the tank.