Hot or Cold question

So i recently set up a tent at my place and I have a small problem. I first set up the tent and had the warm air venting just into the room and temp. was climbing to slightly over 85 degrees F. when the lights were on (dont know how cool it got at night) I thought this was too high so I did a little work and ran the exhaust into the heating vent which worked better then I could have hoped. Now the tent with the lights on gets up to about 78-79 degrees F. with the lights on and drops to about 68-70 degrees with the lights out at night.

So, My question is this. is it better to have the high temperatures in the tent or the low temperatures during flowering?

*here is a link to a thread if you want to see more details or pics of the grow*
https://www.rollitup.org/colorado-patients/486444-my-new-tent-pics.html

a 10degree movement in temp between lights on and lights off is perfect...and a max temp of 78-79 is perfect...soooo.....what you have going on right now is the ideal temp(in general) to grow weed

Yea I was more worried bout the low end of the temps then the high end right now. Ty for responding so quickly +rep Massah