are you serious LOL stay away from the Christmas lights. same with the regular 40w or 60w lights stay away from those you need at least CFL lights.
go to home depot and get 1, 2, 3 however many sockets you want. and get the light for working under the hood on your car the ones with the plastic cage around the bulb. like 5 dollors each get a couple or a few of those.
then buy a bunch of light spliter's make on light into 2 add another you get 3 lights per cord. there like 80 cents each
get Daylight and Bright white CFL bulbs the ones you use in your house lamps the bigger the better. take the cage off the light socket add 1 spliter for 2 bulbs or 2 spliters to run 3 bulbs have a few of the 3 bulb setups one over each plant. 5-pack of bulbs under 10 dollors. that will be the cheapest way to do it and get halfway decent plants.
or if you can come up with some money you can search the web. craigslist ect. for a cheap 250w or 400w HPS setup they will be close in price so its worth getting the 400 cause in a year you will probably be getting one anyways. that way you do it the rite way from the start. its worth the investment it will pay for itself over and over anything you add to your grow will pay for itself.