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DrFeelGood
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I like the idea of a center screen, but why not put two intersecting center screens instead? Cut your ScrOG into 4 instead of 2... Ultimately providing another area for center shoots to climb.
You really do not want vertical screens any where other that at the perimeter of the horizontal screen. The only reason I have one in the center is that there are two lights on it and it will not cast a shadow anywhere onto the plant. The idea here is to catch wasted light and increase the surface area. The screen you are talking about would bisect the 4' X 4' screen either along the line of the bulb in the lamp or perpendicular to that line at the midpoint which would most likely cast shadows on a small area of the horizontal screen. But there would be a bigger problem that I would expect and that would be closeness to the lamp.
Dr FG