This is my 1st run with this - I've been doing RDWC (still am) - but I recently added this on. I'm not sure what I'll yield. I just past week 5... Mine have been psyched with the 600W. If I had another, I'd swap out the 300 and have 600W on each. The one under the 300 the buds are looking nice, but the ones under the 600W are super tight and hard and starting to really get stacked. That's the difference. Also, keeping them nice and SCROG'ed flat.
This vegged longer than I had planned, about 8 weeks - and after moving them into the flower room and getting the tray all set up, I didn't have much more height to go. So, I haven't let them spread up and I have the LED's almost as high as I can get them. They're about 10" off the tops and despite conventional wisdom, they are happy. In the same room is my RDWC under HPS, sealed hoods vented outside - and those plants are showing heat stress. The LED plants do not - even at 10". Go figure...
All off these are the same strain all under identical conditions except the flowering light wattage.
The bud (5 weeks) in 300W:
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From the 600W - they're a bit further away - but they're much more dense an thicker:
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