I don't think they have harvested that room yet to even know what their return is. Also not sure how you can tell how tall they are since you can't even see thru the canopy to the bottom. I guess you are a little caught off guard to see your beloved jungle boyz using new tech. That's ok, you'll get over it, lots of big commercial growers are using LED now and crushing it. Like someone else said, check out the GML show, and catch up to the new tech. I can't speak for anyone else except myself, and I can say that after growing with a 600w HPS for years, I'm happier using my 480w HLG QB96 rig instead.