Sorry but UB actually doesnt believe that yields are a valid benchmark, he has stated this many many times lately. Your best bet for getting max yield is doing a SOG with atleast 2-3 plants per SQ foot. I do 4 per foot. Or a SCROG. If you cant pump in lots of fresh air then you need to go with CO2 , it will give you much better yields. I have used it and it does work. Became too much hassle for me so I just put loads and loads of fresh air in my room .I understand what you are saying and the information you have provided is some of the stuff I was hoping would become available. I see so much information on the net, its very difficult to know what is credible and what isn't. I am trying to get information specific to cannabis and that can be tough. I will read through the information you have provided along with the other information that has been provided. I think you will agree that yield is what determines your success (many times, not always but many times) as a grower. I am getting only a little over 1 lbs off of a 1000 watt bulb. Therefore, I think I must be missing something. That was the reason for the title. Thank you for an informative response it is appreciated.
Someone else mentioned PK boosters. I use Big Bud still for mid bloom booster , works great. Overdrive is great but way overpriced. I currently use MOAB its much cheaper and works atleast as well. Its about $70 for 2 lbs and you only need a teaspoon for 5 gallons. I used Koolbloom but it caused a lot of hermies so I stopped. Super Natural Bud Blaster is great too but very pricey.