Advice needed on changing 12/12 schedule

I'm on 12/12 now with on at 7am...off at 7pm. I need to change to on at night / off during day. I have heat issues when day temps start getting warmer.. adding heat is no problem but A/C is not an option
THANKS RIU PEOPLE

the transfer will set you back 1 to 2 weeks...

the357ink said:

the transfer will set you back 1 to 2 weeks...

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what about rolling 1/2 hr ea day ....is that gonna set me back

no matter what you do it will cause stress to the plant, but i have no idea how to tackle a problem like this, hope things work out