Adding light during flowering?

Okay, This may be a stupid question because I know the more light the better, but I'm on my first grow and don't want to fuck it up. I have two plants about 2 1/2 ft tall, each in flower. They've been flowering for about 3 weeks under 2 of the biggest CFL's I could find and a flouro tube.. I'm seeing buds and crystals at quite a few sites. My question is this: If I add more CFL's.. say 2 more of the highest wattage largest bulbs I can find, will this help my yield?

My guess is yes, but the reason I ask is I'm concerned that it could possible shock the plants since they're already 3 weeks into flower.... Is introducing them to more light bad at this point, or is it a good idea? Being broke as I am, I actually happen to have money to help my box right now, so any answer is greatly appreciated and might send me up to lowes. (and for you HPS guys... i know, i know.. i'm doing that next time believe me, but i have to say the buds from these CFL's look super fine and it's just some bag seed .. bigger yield w/hps though i know )

Hey, man, what if they were outside? Wouldn't they see cloudy days and sunny days too?
Add the Lights, I hope yu have those 85 watt Spiral CFLs.
Peace,
Roseman

Yes, adding more will help... I am using 2-42w 2700k per plant the more the better, just added some 14 watters near lower bud sites 1 inch away... I will change to HPS as well when cash flow permits, but buds look OK for first time with bag seed... not super big but did not expect any first time....just wanted to learn how to do it... now I am hooked on growing.

add the lights.

awesome, and yes to the first responder i am using the spiral 85 watters, and an unknown flouro tube... i'm going to go get 2 new CFL's to put a little lower on the sides to help out the other bud sites.... thanks guys, i don't think i'd have been able to grow shit without this site. ez_growin: sound's like you're in the same position as me... first grow and doing better than expected i'm hooked too. I'm using fish emulsion... seems to be doing pretty well.. i'll probably get more advanced next time, but as of now i have no problems.