if you are are referring to incandescent lightbulbs, then not very well. 90% of the electricity they consume is turned into heat. get some CFLs, and even then, you'll need many more when it comes to flowering. and don't forget about nutrients as well.

you also might want to invest in some soil. using outside dirt is not a good idea. it could contain bugs and fungus etc. your inside environment should be as controlled as possible. not to mention the makeup of the soil might not be proper for cannabis. cannabis likes light, airy soil. you might considered ammending with perlite, at the rate of 1/3 perlite to 2/3 parts soil.

you've got a bunch of reading to do.


-shake