start off by throwing that incadescent bulb in the trash, and go to walmart and get yourself a couple of cfl bulbs.. they are those new spiral bulbs .. get yourself like four of the 26 watt ones.. they usually say that they are 100 watt equivalants.. or better yet, get yourself over to home depot.. they have 65, 85 and i think a 120 watt cfl, complete with a ballast and everything for maybe like $60 or so... the ballast is the part that delivers the needed electricity to the bulb.. these aren't in the bulb isle, but rather in i think like the outdoor lighting isle, and they are used for outdoor floodlighting, and that maybe what the box says on it, but it is kool to use them indoors.. if you have got money to burn i would even suggest going to a site such as htg supply and looking at the complete lighting systems section, you can get yourself a nice setup for one plant for about a buck fifty or so.. if spending that amount of money, i would go with the hps setup.. you could probably get a 150 watter complete with ballast and hood and ready to plug and play for about that amount of cash..or you could also go with a 150 watt cfl that i think they have, but they are basically the same price as the hps, and you will get much better results with the hps..
the major problem with normal household lights are the fact that they waste most of their energy making heat instead of light, and what little light that they do make is all in the wrong spectrum for plant to grow and thrive under... cfl's run much cooler and provide a much better spectrum of light for plants to grow under, and hps and metal halide even better yet, but of course these cost more duckets..
i am not sure where you live, but if the temps are still decent outside this time of year, like maybe in the 60's or so, i would put that baby back outside untill you get some probper lighting.
do yourself a favor, stick around here and do some research on your own.. there are plenty of threads about growing with cfl's and hps and whatnot, or even better yet, run to the bookstore and get yourself a good grow book that breaks everything down.. i would recomend the indoor medical marijuana grow bible by jorge cerventes.. good luck in your quest for herb, and remember everyone starts somewhere..