I can share my fear with you and maybe that will help.
"XYZ"
I have 1.98M (78Inches US)
I am worried about max area with my pots, distance from tops to lights, and height of hood
(A+B+C=X)
X is the minimum distance my equipment requires.
If my gear requires X (inches or meters) then how much room will I have for growth.
Max Height of Grow area = Y
if you subtract X (equipment) from Y (Grow Area) you can see Z.
Z would be the maximum growth height you could have in your alloted area.
In my case I am looking at
Z=38" as a max height I can sustain without damage from my light.
Heat is a factor, I have 2M high area using a 435 cmf exhaust keeps me about 10F warmer than outdoor temps.
I hope this helps check out my grow and tell me if you all have any tips!