That light will produce a ton of heat and will become extremely ineffecient as your plants get bigger. You will have to have more of them which will make more heat and jsut run up the electric bill. If your looking for cheap yet effective go with some CFL's they are very inexpensive and will be alot better for your grow room, i.e less heat more lumans and lower electric bill.

Also having them in the same pot is not good, not good at all. If you can get em into seperate pots I would, so they don't have to compete with each other for nutes as they get bigger.