It depends on how stealth your operation has to be, right? there are alot of factors you must consider. for example:

How big will you let these things get? So ok you say your shooting for 4 girls. sounds like a good plan to me! Remember 4 plants will reek like crazy. You say you will top them? For sure this is a good idea for these things will just devour this space you have.so it really depends on how stealth you have to be. roomates , parents a problem ? Then maybe 4 is too many.

Your question for the lights. If you have the resources (electircity and money)for more lights then go for them. you can always shoot the cfls into the forage from the sides.