Yhea plant canopy 2x2 ft at 16 from a HPS 400 and now that you mention this lamp prob has more grows, it came from a grower. My growshop its 200km from me you think i should get a new lamp?
Another battle im having is with ph it goes from 5.7 to 6.7 so everyday i add PH down GHE (nitric plus sulfur acid) to 6.1, so I wonder if this can influence the uptake or anything else
Btw thank you so much for your time