As the plant shown is the first one I've come close to finishing under LED, I don't have an exact/avg yield yet, but I will take pictures and weigh that one when finished. This was grown under a 65W CFL to start, then a 90W LED for the remainder. I added the 120W to the 90W to fill out the rest, and I have them set at opposing angles to reach most of the under-brush.
As for light penetration, anything over 90W seems to be able to reach down to the bottom effectively, even with the light source a good 5-6 feet from the plant. The majority of the newer generation all still have their first primary leaves intact and healthy through veg and into flowering, so I would say I'm very happy with that- I will take more pictures in a couple days to show.
Only a few airy/underdeveloped flowers on the first plant, off of branches that were less than 1 cm long when flowering started.
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