She was doing fine up until last week, when she developed brown spots on some leaves. Kind blade smokemaster helped to diagnose a K deficiency due to a high pH. My pH tester is a milwaukee ph600 and I'm having problems with it, so I'm going to try to get another tester so I can adjust the pH. My plan is to flower her when she's healthy again.
She appears to be N deficient, too. I've just repotted her into a 3 gallon fabric pot. Soil is FFOF + bit of extra perlite + worm castings. She got wilty after the transplant. I've been misting her and she started to perk up yesterday, but she always gets droopy at night, and I took these pictures during lights out. I think she gets droopy because of low humidity. It ranges from 20% to about 35% RH.
The cabinet is a 14" x 14" x 60" tall broom closet with a semi-air-cooled 150W HPS. There is a 80CFM duct fan on the hood, but the hood intake is only a few vents on the hood, plus the space between the glass and the hood (I removed the little bracket that holds the glass in, but the glass is still there.) When I tend the plant my hair always gets sucked into the hood, so I know it doesn't have enough intake!
I have 3 intake ports -- 1 x 4.75" with a fan blowing on the light, and 2 x 4" intakes. One of the 4" intakes is passive, and the other (near the floor) has a 120mm server fan on it (about 136 CFM with about 11 mm H20 static pressure rating.) I'm hoping to rig a wicking wet rag onto this fan, for a "ghetto-style" evaporative cooler.
I also have another fan pulling air across the light (rather inefficiently), and two exhaust fans in the ceiling, with a wire tray under them. Eventually I'll put carbon in this tray. So, all together I have 1 duct fan and 5 x 120mm PC/server fans. I have more PC fans waiting in the wings. My favorite PC fans are Panaflo hydro bearing 120mm fans because they're relatively strong yet quiet. My next favorite are the Delta 120mm. They're very strong, but loud. The strong PC fans are 38 mm thick.
Right now the temps are about 82° with lights on and 77° with lights off. I couldn't get the whole cab in one picture I'm posting 3 pics: bottom, middle and top.