lighting formula question

[Jimbo E]

Ok, I have 4 plants in a 10 sq.ft. bathroom. I have 20,100 lumens of CFL's & 15K HPS which equals out to 35,100 lumens & from what I've read, I should only need 20,000 minimum for a 5'x5' room. Is this right ? Also it seems, from what I've read, for 10sq.ft. that 500w of lights is optimal & by my calculations I have 474w which should be sufficent, right? I just want'ed to pick y'all vet. growers brains a little because I want this grow to be the bomb. I can always add more CFL's if need be. BTW. these plants are only 4 weeks old, but their looking great. THX for any thoughts or suggestions. ...PS.I'm sorry if this has been a stupid qusetion but, I'm kinda'new at this indoor growing thing and I need all the help I can get...THX AGAIN