Heat stress is part of it. Get an exhaust hooked up ASAP and if that hood can be air-cooled, hook it up directly to the hood.
For more detailed info, you should fill out the troubleshooting form stickied at the top of this section.
stinkyattic Reviewed by stinkyattic on . Possible K deficiency [PICS] Our plants are about two months old and were stunted for the first month due to lack of good lighting. We remedied this by getting a 400w HPS. Currently, we do not have a fan. First, the leaves got very droopy and then started turning yellow on the lower branches starting at the outsides of the leaves. The viens turned last, not fading until almost all the color was drained out of the surrounding leaf. There are also some brown spots that almost look like small cigarette burn. Some of the newer Rating: 5