1st Grow - Purp Kush & Crown Royale SCRog - Flip time soon?

[YodaTheRedEye]

Let me begin by saying thanks to everyone who helped me with my purp kush deficiency early on. As you can see she is kickin' ass now (plant on the left). I have read that it is time to flip when approx. 75% of the screen is full for indicas. I am confused about what is meant by the screen being "full". are you supposed to wait until 75% of your screen has tops popping up or just until the branches of the plant have covered 75% of the screen? Do any of you veteran growers have any good pointers/advice in regards to knowing when to switch into flowering? I thank you all in advance and peace out!

 

[CoralineJones]

switch to flower once 75% of the screen has bud sites poking through to maximize yeild