i believe im agreeing with patrickkawi. Everyone is too focused on more light. weight doesnt really come from more light! It does but it doesnt when going for 1 gpw. weight comes from canopy size. 4000 watts in a 10x10 will yield more if you have nice full canopy. 4000 watts in 8x8 will yield less. why you ask cause you have more plant coverage in a 10x10 than 8x8.
what people need to do is use up as much of the light as possible. also vegging for 3 months dont mean anything all you get is to use less plants at the cost of more time. If i could i would use more plants and flip the lights for 12/12 to start flowering after like a week or 2. enough that it will be a sea of green. and load it into a 10x10 with 4000 watts. you can veg 4 plants if you like and top them alot and veg much longer to fill the canopy of the 10x10 and still yield the same. yield really has nothing to do with how many plants. i hear this so much i have this many plants and each plant is this weight! That doesnt mean anything. Also when you grow from seed and you said you saw the picture of how its gonna turn out. Thats bs too. it might turn out similar or very different. seeds are like the children of the parents! brad pitt and angelina jolie have kids and doesnt mean the daughter will look exactly like angelina, hell maybe her kids come out retarded then what. Clones are the way to go. cause if you clone angelina what will you get, You get angelina pretty much. also bigger number of plants means more uniform control on spacing between stems of buds. everyone needs to find their favorite number as cost of clones and type of watering system plant beds or 3 gallon buckets or 5 gallon buckets and hassle of number of plants vs veg time.
so to summerize this
4000watts over a 10x10 canopy fill like a jungle with 100 plants can yield lets say 6lbs is pretty decent average
4000watts over a 8x8 canopy fill like a jungle with 64 plants will yield 3.84 lbs with the same grower same everything.
of course this is just an example cause the effieciency cant be perfect maybe 4000w is perfect for 9.5x9.5 but for a 10x10 is a little under but for a 8x8 is way too much light. (this is just an example) so maybe the 8x8 will yield 4.5 lbs but it is still a lower gpw than the 10x10.
in other words if you have 10000 watts in a 8x8 and you can get temps controlled you will have the worst gpw ever cause adding more light like that is just stupid so people stop trying to keep adding more light than the space permits. its all about using as much space as possible per light. someone please shit on me if i am wrong as i have only done 2 grows. but believe i have a great understanding of how to get most yield where most people just dont get it.
And also i have a theory on fan leaves covering buds.
i dont believe the buds matter if they get covered much or not maybe a little. I believe the fan leaves are like solar panels that absorb the light to convert its stuff to energy for the buds to grow. If you cut off fan leaf to clear it for the bud you just lost a solar panel. sure the buds absorb light too but their leaves are tiny compared to that big solar panel you cut off.
This fan leaf theory is just that. something i am still thinking/pondering about. can be totally false or maybe right on the money. Anyway i hope this long post can help explain this to all the people who are scratching their head why more lights per sqft dont make more buds, at least not really.