For your vegging you should doeither 18 on 6 off.
or i have seen people keep thm 24/0
and when you feel about right for your plants to go into flowering.
switch the lights to 12 on 12 off.
83 degrees is prime.
as long as its not in the 90's
just spray water with a water bottle moisten the leaves a little.
unless you start seeing heat stress then you got a problem otherwise your good.