Once, your plants get more than about 6" or 7", that bulb will definitely be inadequate for that plant. Pick up a couple 42w or higher (42w is just more common at places like target, etc.) and supplement that light. They'll work fairly well for vegging, but you're going to need a bit more wattage if you want to harvest a decent amount. Flourescent's can be placed quite close the the plant. You can put 'em as close as you want, as long as no leaves are getting heat stressed. Also, tin foil can create problem with scattering light and differences in intensity, so, you might want to consider using flat white paint/materials. Flat white will give you more even light distribution.
~ooli~
