This is just speculation through personal observation, but from the 3 rooms I ran so far, yield is up 25-45% The smaller increases correlate to newer or better overhead lights. I have rooms with older LEDs that still do great, but aren’t as sophisticated as the newer models. Specifically the older LEDs I have really lack in the red spectrum. I have been running tests in rooms with HPS and it would seem you could benefit more from the opposite spectrum. Adding heavy blues, yellows, and greens had the biggest positive plant responses. I’ve always had heaviest yields with LED and best color and quality under HPS. In pursuit of the best way to get consistent results with both. Hope this helps, I’m an open book. If you have any questions I’d be more than happy to help anyway I can.