It'll do something, it can be done. Althought, it usually leads to plants stretching, which will probably give you less bud production. It'll cost about 20 bucks for a few cfl's. Not only can you take more control over your plant, increase bud production, and (usually) finish sooner, but it'll only cost you 20 dollars.

It's like this. I can put my tomato plant in a window. It might have some problems, and the tomatoes might not end up very big, but I will have successfully grown tomatoes nonetheless. Or, I could plant my tomatoes outside, water them, feed them, and give them plenty of sunlight, and they'll end up huge. Now, they may not end up huge, but there's a greater chance they will.

If there's two paths from A to B, which one is correct? Both, though one may be faster and more fulfilling.