Can I start Flowering at 12/12, then go UP to 14/10 on/off??!!!

Hey i was wondering i am growing 2 super lemon haze with some auto's. They SLH are getting pretty tall, they are 39 days into veg, as well the autos are 39 days in. i have one room only. I run 19.5/4.5 light cycle. can i change to 12/12 to start the slh flowering, then switch up to 14/10 and still kepp the SLH in flower?
Im using 600W HPS. 4x4x7 tent. 6 Auto strains, 2 SLH, and a Chocolope Kush fem.
thanx

I think that at 14hL/10hd you might be giving your SLH a hard time.

I would cater to the SLH, and the kush, not the autos, if that is your reasoning.

Let that SLH and the C kush do its thing and make sure it gets what it needs, those sativa hybrids as SLH can be delicate. Think of the autos as a bonus, I'm guessing you have one room, try to set a veg room up so you can run auto's and veg at the same time all year round...

FJG

Well it's a sativa dominant strain and sativas are pretty finicky as it is with lighting to flower. Some strains you have to go down to 10/14 so I would just go with 12/12 man all the way through

Ok thanx for the advice i will go 12/12 starting in a few days. I have a dresser gutted out and a crap load of cfl to make a veg room