2 wks after flip is normal for the start of bud development. 
If you want buds within a few days from the 12/12 switch, 3 weeks before 12/12 switch to 16/8 for a week then 14/10 for 2 weeks. On my current grow, there were white pistols 3 days into the flip @Dr.greenthumb83. I also start easing into bloom nutes and backing off the grow nutes at the same time. That way when I do go 12/12, I can feed them full bloom nutes.
I don’t see any bleaching, I think that is just where new growth and pistils are showing a lighter color
I agree with @TDubWilly
The tops will show a light greenish yellow color when a growth spurt is happening
Well thats good news to me guys thanks allot
Next crop ill give that a try…i went from 60 days of t5 flouresant 24-7 right into 2 -1000w hps 12-12