...I believe the 1k has a 4'x4' sqft coverage with your bulb at optimal distances....so, you could use 2-1ks, but you'll more than likely have heat build up in such a tight space....hopefully you can aircool the bulbs if you decide with 2.
^^^...what he said. I'd also be sure that light isn't getting into your res, nor do you want any light on your roots/rockwool....aerate your res, and try to keep the solution cooler. Fungi likes it warm and low oxygen. :goodluck:
...do you have any pics to view? ...all of your plants doing this? ...is your foilage discolored? ...have you fertilized? ....how close is the light source?
...sup 420! I'm working with 2- 4x8 floodbeds ...each flood bed will have 3-600 watt HPS.... I'll be using co2 enrichment (1500 ppm during all daylight hours....I'll be using the Lucas formula for fertilizers (gh micro,bloom) ...I'll be flowering my ladies with zero veg, or straight out of my...