We are determining the surface area of your intended canopy and as the surface area of a cylinder is Circumference X Height, you do need to know the circumference.I couldn't follow that.
Circumference has nothing to do with it. Did you mean diameter? To figure your area you use diameter or twice the radius X 3.14 X height. Or 3.14(diameter)(height)
A diameter of 4.1' gives you 5,000LUX at 2' high. At 7.7' diameter you would have 3,000LUX. That would give 48.3' square at 2' high. At 3' high this would give you 5' diameter.
At 5' you get a 15' circumference 3' high so you could grow about 7, 3' high plants. If you get 5oz per plant you will hit 1g/Watt.
In regards to the comment someone made about the grow space, this vertical grow will in theory take place in an 11' tall room and not with trees. I would love to give more details on the grow including plans and all but I tend to be a touch bit paranoid considering how many times growers have gotten nailed by Big Brother.
What i will say though is that the grow area will be a cylinder wrapped around the lights with the area underneath the bulbs being used for fans trained on the foilage and the area above to evac air. The plants will grow to within about 9" of ceiling.
Also, the reason i will be using 1k lamps as opposed to 600's or anything else is bc 8" Cooltubes are around 20" in length and I need to have the largest radius possible in order to be able to get in and work with the plants.
This grow will in no way be like the screen grows that I've seen from Jig and a few others simply bc i don't intend to train my plants that much or veg them that long although there is much to be said in regards to the effectiveness of there grows. They are quite effective but not what I'm going for.
I really wish that I could give more detailed plans and such but even being in a medical state doesn't make me feel safe enough to present this to an open-to-all audience.
Happy growing though all