Not to argue or say "that's not it...etc"
But to get strong plants, once you "pop" the seeds and they are in soil or other medium- they need light to get "above ground" just like in nature-- but windowsills are not a good option for everyone... all depends on where you live, the type of window/glass, the exposure of the window (N-S-E-W) trees in the way etc... Most often, they end up stretched, pale and stunted....
just a 100w output CFL is plenty to sprout ...add more lights as they grow....
If you plan to use CFL's, there is info at the link below--
http://www.marijuanagrowing.eu/how-to-use-cfl-s-to-grow-mj-t23291.html
But I whole-heartedly agree with "curious"...
a T5 would be a worthwhile investment-- much higher output per watt, better spectrum etc...
If you get a 4foot 8 bulb fixture, you can just switch 1/2 of the bulbs to bloom bulbs when you go to 12/12.... until you can get an HPS.... for 10 plants- you'd need a 1000w HPS in a large glass-enclosed hood... or at least 2 of the T5 fixtures I mentioned...