Quote:
Originally Posted by srusso
B/c only one side of your screen can be lit when your screen is horizontal, which means half of the growing surface.
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I think the question was two part...
A vertical scrubber's effectiveness with lighting only on one side is reduced by 50%, so you need to double the size of the screen so you can light the same amount of square inches as a double sided scrubber.
I believe horizontal scrubber's effectiveness is reduced even more because of the water flow and surface area exposed to the air, so you need 4 times the surface area of a double sided vertical scrubber.
When I was building mine I was really considering either a single side or horizontal scrubber because of space constraints. It was stress to me to go with a double sided scrubber.