get a light meter and check them. most hps bulbs last 22000hrs. a new one at 3 12/12 cycles is only at 1080hrs if u ran 3 months.ive been running a 250hps for 10 cycles and not loosing signifigant yield like within 10g. ive got a new one as back up but im not willing to waste money for very...
id just keep it as close as you can then. the lumen intensity just starts to diminish the further away from the bulb. if you ever get board pick up a light meter and check this at different spots on your canopy you will see it goes down something like 25% a ft not sure of exact numbers but my...
im not running a 600 but a 400 and im about 3-4 inches away air cooled. temps make it possible and im not showing any signs of burning. u talking air cooled or open?
the cheap ones waste alot of plant matter. carrots especially got to juice and press the pulp to actually get something out or it. best way to uptake essential vitamins carrot juice is a great calcium supplier unlike milk.