I have been growing indoors for about 3 years. I am currently using a 3 x 3 tent with a 315 watt CMH light and exhaust to a carbon filter. I am using GH’s flora series. I do not use any other amendments. I just harvested an Afghan OG that I grew from seed and netted 11.3 ounces, which is just about one gram per watt. I have heard that one gram per watt is optimal, but I imagine there are others who get even better yields. I never weighed my other grows, so not sure how efficient they were. What is currently thought to be the upper limit in terms of grams per watt? Is there a theoretical maximum?
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For our purposes a gram per watt is a good result. I’ve hit 1.5 with the right strains.
Others are at 2+
There are many more complicated metrics, all with merit, but a gram a watt is pretty damn good.
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Exactly what @Foreigner said. A gram per watt is pretty decent. I struggle to hit that mark at times.
There are other metrics that are more insightful. For example the grams per watt says nothing about the size of the grow area or the length of time that it took.
I like grams/kWh as that gives a time and takes into consideration veg and flower times. It still doesn’t account for the space of the grow. But grams/kWh/m³ is a bit too cumbersome IMO.
Grams per day is an easy one to measure and useful for comparing progress grow over grow where your equipment stays the same. It’s also useful to see if you will outsmoke your current harvest. 
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This is true. I hit 1.5 on my last grow but it was a far leaning sativa that took 13 weeks. I could have almost done 2 indica runs at a gram a watt in the same time period and been way ahead yield wise.
But it’s not all about yield.
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Quoted for truth!
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Great job buddy
Something that may help
Try growing scrog style It will increase to yield
Also method flood and drain vs soil vs Octopots
Different method can increase your yield
I went from soil in 3 gal fabric bags 9 plants scrog style topping out at 12 to 14 oz
Too Octopots with only 4 plants mainline style and depending on genetics 16 to 20ozs
Feeding schedule also ( what you feed and when )
Good luck and have fun most of all
Paps
The gray haired bandito
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