He has a second video on the same topic but I'm not sure he mentions how many strings in that video either. If you figure it out let us all know.
At about 1:03 he states 8 red and 8 blue 100 ct strings together on every other mounting screw and 8 white and 8 green on the others. He goes into great detail in this video to how he wraped it. Well worth watching it all.
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LoginHe has a bunch of videos where you can see the tree in action. You can start with this one at about 35 sec.
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LoginHe even has a third video with the parts he used for the frame
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LoginGood luck
Ron