1st time grower, when to turn lights to 12/12

Okay so this is my first indoor grow. I have done quite a bit on my own and things seem to be looking good. I started with plain ph balanced water for the 1st couple times watering and then started doing 2 ml cal mag. After a week of that I am now doing 4ml cal mag 4 ml micro, 4 ml grow and 2 ml bloom. but I do have some questions about flowering. I am at week 5 starting today. The packet I bought the seeds in says flowering time 9-10 weeks. Does that mean when I start flowering or is it when it should be done producing bud? Any help would be appreciated
 

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Oh nice I have viperspectra 450 w I was asking because you plants looked pretty tall compared to mine. And I’m convinced it is the light! This is my first grow aswell.
Lol yeah mine have shocked me actually. 1 of them is 60% sativa. They tend to grow taller. How many plants do you have? I think 450 would be just enough for 2
 
I have 3 but getting rid of one because like you said only enough for 2. They are indica dominant 1 pemex and 2 blue thunder.
Do you have pics? I actually am worried about the left 1. It's a gelato seed I found in my bud from the dispensary. The one on the right is the sativa OG Kush x Haze
 
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