If you have a window in the attic get yourself a inline fan so it sucks freshair into your grow room,this fresh air will help with your plants yellowing problem youll also need to extract with another fan,you can put your lights on a timer if you want,personally i do it manually,just make sure you got a rely contactor for your 600 before plugging a timer in,try read as much as you can,get your enviroment sorted first and take it from there,good luck.

Baldy.
baldyhippy Reviewed by baldyhippy on . If someone can be of some assistance I am in the 6th week and I am at a loss in this grow cycle. At the moment I have a 6 plant eco grower unit with a sylvania 600 watt grow hps bulb I have the homeboxXL and a digital ballast. About 3 days ago I noticed yellowing starting to occur. But before the yellowing had begun the plants were in great health. So far I have done everything in my knowledge to fix the problem. I had talked with various people and they had said overewatering but isn't that impossible with the system I am using? Rating: 5