Whats your take.....

So heres my situation..... Im using a Growlab 80L I havea 600w MH and planning on using a HPS for flowering. My problem is Powdery Mildew. I live in a smaller home, and dont want to sulfur burn. So to try and counter the PM I have bought a Dehumidifier. It is a larger than I expected so I have stuck it outside the tent and I am using it to pump air into the tent. With another fan pulling air out. I figure I keep circulating dehumidified air through the tent I will achieve a lower humidity. So far in last the week it has lowered the humidity to 27 - 35%. I figure this is good for the PM, but now to a new problem. The hot air its making has raised the temp 5 degrees in my tent with my bulb at full power. (My ballast can reduce power to 60 or 75%) So right now I have it at 60% to keep the temp below 80 degrees. Is this dehumidifier worth the heat it is creating within my tent. Note I havent seen any white PM dots on any leaves since humidifier has been put into play.

Another thought is if I put in extra fans and put the power to 100% again but the temp stays at say 85 degrees will that kill / effect yield of the plants?

Thanks for reading, looking for any comments, math, or solutions to cool down my tent and getting 100% power back to my babies.

Add Info.... My bulb is in a daystar hood I have a 6inch inline duct fan pumping fresh air through it. Ran with its own duct through the tent. No air from it is getting into the tent.

85 degrees is fine, try to get it around 70 during lights out

rofl whats the other 99% and are you saying that stuff works good? im confused.....