Temperature and Lamp Distance

I am curious about acceptable heat range for room/chamber. 24-35 C (75-85F) is OK? (that's about 75-85F)
Also, running two 400's at about 34-35 cM (11-12 in.) from Bulbs...too close?
And a final newbie thing... pH's at 8 coming from tap... is adding bacon soda advisable? Or Lye? Pool pH test is Way pinky! Assist Pls.

Yeah, that temp is fine.
Lamps are a little close, if too close, your plants will tell you.
Adjust your pH down with an acid, like phosphoric. Best soil pH is 6.3

HTH

Thanks for the heads-up.. what common product for phosphoric?

Ouch. That sounds overly warm to me, as 35C actually equals 95F not 85. I believe that's the absolute highest temperature you'd want to go, but only if using C02.

Also, that's a very large difference in temperature, so you'll likely have major condensation issues.

The safe range to aim for is 21C to 27C. See Mogie's post here.