when do I change DIF ?

[BackWoodDrifter]

I am 5 weeks into 12/12 my my high is 81 degrees and that is minutes after lights come on- a spike in transition of heater going off and lights building heat- rest of day 77 -78 high - night temps are 66-67 degrees when should I raise my DIF and what is the night low I should strive for ?

Hello friend not 100% sure what yual be askin but yur temps be soundin spot on with me mine be the same and be doin great for me Hope yual do well pilgrem like to see folks like yu win in the grow specialy folks be havein great screan names! Hope all gos well for ya partner.

BWD