when to switch plant to 12/12

I want to conduct a micro grow and I have limited hight to work with. I know that once you switch the plant will grow twice it's size( So I've read) So in a nut shell, to minimize height when should I switch from 24/7 to 12/12. Thanks all and happy growing friends!
 

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I want to conduct a micro grow and I have limited hight to work with. I know that once you switch the plant will grow twice it's size( So I've read) So in a nut shell, to minimize height when should I switch from 24/7 to 12/12. Thanks all and happy growing friends!
Well I guess when it has reached .5 of your allotted space?
 
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