for just a few plants, get the cfl's they are the most efficient for the space you have and moneywise they are ok. i made the dumbass mistake of using the big (4 foot) fluorescent fixtures these things are underlit for flowering as I;'m finding out (I'm into my 5th day of flower), oh well, but the cfl's are more efficient, smaller, produce way more lumens. are you tabletop or floor? what kind of fan are you using? stealth or in the open? all these come into play before you purchase anything, check your space, what can you fit? intake. exhaust?
window light will not do it, you need a minimum of 50w per plant/ 75w is better. the lights should be close to your plants. if you can stick your hand between the plants and your light asnd it's not too hot, then it's ok foryour plants. for fl's they should be no more than 2" from your plant tops. take a lookie at my posted pics, see how close they are to the lights? get a fan to blow across the plants to promote sturdier stem growth (you are replicating mother nature with her breezes) keep them warm 80-85 with lights on 65-70 light off. don't overwater and no fertz for the first two weeks after germinating or transplanting (they are shocked and need time to adjust to their new surroundings)