about to flower lighting schedule question

hey guys i am about to flower my first grow and i have them on 18/6 with cfls. i was wondering if i am about to flower should i go right into 12/12 or go 18/6, 16/8,14/10, then 12/12 to make it more like the actual season change. and i do that should i progressively switch to 2700k bulbs or switch them all at one time?

Just switch.

just switch directly to 12/12 it wont cause any shock to the plants. switch all your bulbs at once too