Wow....22 gallon garbage cans? That's going to take up a lot of valueable space. You don't need to have a timer as long as you'll be near your plants. What type of light cycle will they be on? 24/7 (obviously no timer needed) 18/6? or other? You could either use a bunch of CFL's or one HID. A 400w switchable would be perfect for your space and you'd have the bulbs you need for both phases...hps for flower/mh for vegging. They can illuiminate up to 5' x 5' garden. A surge protector is good for safety purposes. And most HID's can plug into a grounded outlet with no problem. Some people have had amazing results with CFL's but on the whole you'll get more yield and denser buds with an HID. Good luck, Happy Growing and Peace!