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LoginI think for an 8-foot tree, you'd probably want to use something shorter than a 100-count, 24-foot string (or be willing to wrap up and down and up and down -- quadruple).
I built a six-foot tree over 2010-2011 (what can I'm say, I'm slow) using 16 50-count, 12-foot strings that were up and over (doubled) and it came out nice -- I think the diameter is something like nine feet. I used PVC pipe for the trunk and four spokes and ran a circle of PEX through "T" fittings on the ends of the spokes. The elasticity of the PEX kept the strings tight all season (though this is the Bay Area, where the difference between June 25 and Dec. 25 is that it isn't as foggy on June 25 -- same temperature).
I'm not sure where I got the "plans" (ahem) for this setup (prolly over at DIYC) but I'm positive it would go two more feet without a problem.
The problem is figuring out the length of strings versus the diameter of the ring, which is what the tool above does for you.
HTH.
\dmc
PS: I used LED multis and was quite happy with the effect. I also used four DMX/SSR4s, but could have used a Lynx Express (and may this year -- I have a kit unbuilt sitting right over ... there).