Quote Originally Posted by Volker
7 x 27W CFT (6@6500K, 1@2700K) ea 1600L+
Total 11200L+ or ~2500L / ft²
Those L figures are "straight line" math. As you can see, the bulbs are clustered to one side of the shelf space and are directly above the tub, which is 14" x 20" = 280 inch² = 1.945 ft², call it 2 ft² for easy approximation. Allowing for "slop", I'm guesstimating closer to ~4500L / ft² where the plants are.