I have had no problems with reservoir temps between 70-78 degrees. Long as u keep the direct heat from the lamps off the plants by either putting them in a cool tube or vented hood u shouldnt have many problems but wouldnt allow ur actual flower spot to rise above 84 degrees which is where i kept mine cooled at. EC and PPM are just 2 different ways of measuring the amount of food in ur water and PPM and EC are strain dependant as some strains like to eat a little more than others a safe max flower PPM would be between 1400-1800 and u shouldnt go wrong as long as u keep ur PH maintained at 5.8 always. Hope this helps. Peace
I have had no problems with reservoir temps between 70-78 degrees. Long as u keep the direct heat from the lamps off the plants by either putting them in a cool tube or vented hood u shouldnt have many problems but wouldnt allow ur actual flower spot to rise above 84 degrees which is where i kept mine cooled at. EC and PPM are just 2 different ways of measuring the amount of food in ur water and PPM and EC are strain dependant as some strains like to eat a little more than others a safe max flower PPM would be between 1400-1800 and u shouldnt go wrong as long as u keep ur PH maintained at 5.8 always. Hope this helps. Peace