photoperiod

Ok, so as a general, most growers flower under 12/12. As most of us know the critical dark period needed for the consequent hormone build up to make different strains flower can change from plant to plant. So here's my question and or idea. Breeders give you an estimate of flowering time eg...

Im wondering if I can use 6700k cfls for vegging. And 2700k for flowering on my afghanis and delahhaze seed. Keeping them smaller for a cabinet grow.

This my first indoor grow. Seeds aquired are auto anubis auto purple and holygrail . under cfls until signs of flowering then going to put umder 400watt hps. Foxfarm ocean forest and happyfrog with added 30%perlite. Let me get some input please. Will update every chance i get