Sealed grow, lung room, double flower design

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Any suggestions to how big the lung room should be or how long I should veg the white widows before flower to fill the room. Construction starts in a few weeks

(Blueprint picture is attached)

Plan is to run the 1k room at night and the 600w room during the day

 

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Here's the photo

 

[Speed of green]

some a/c's dont work in those cold temps, id do some homework.

veg for a month or more dependiing on the medium and 100 other factors, youre going to need to do some training as well to take advantage of the light.