During vegging it seems you can throw pretty much anything at them, it's only once the chemical/hormonal switch has been thrown, from what I have read. Personally I've given my girls a little bit of everything, not really bothering as long as they get 60% or above per 24 hours.
I have read that training them towards the end of vegging by gradually increasing the length of the dark period towards 12/12 can help and am going to try that myself.
*edit* Also, try not make lots of threads asking the same question if you can.