ofcourse it is.you can start the 12/12 cycle as soon as the seedling pop their heads out the dirt if you want.
the plant you have will double or triple in size when flowering(remember that).
but your plant looks good and healthy enough and if you wanna flower now,go ahead.or if you wanna veg for longer you can.its really up 2 you.but because of the lights you have you should start flowering now.
what cfls are you using?because you will probably need alot more than 2 for flowering.