im using 400hps , soil: plagron batmix, nutes: No Mercy Supply bat guano extract, temp/hum: varies alot but it does get as low as 10degrees in the dark periods n when the light is on its around 22degrees.. i really never checked the ph of my water and soil, i jus let water sit overnight to dissolve the chlorine and then i use it. i have 2 other plants but normal plants not autos. and they all seem quite healthy so i suppose my ph isnt too bad