according to the chart, a 400w light 18" from the plants would produce 7074 lumens, 4 inches lower the light is producing 4735 which is below the threshold for what they consider acceptable
this means the top 3 or 4 inches would get just enough while the lower stuff would really struggle to thrive...
also for reference I think the minimum lumens needed for growth are about 2000, mind you this is exluding LED's...
this means the top 3 or 4 inches would get just enough while the lower stuff would really struggle to thrive...
also for reference I think the minimum lumens needed for growth are about 2000, mind you this is exluding LED's...