The beauty of the chrome shelf units is that the shelves are all adjustable.
I set one of the upper shelves narrow for when the seedlings are really small, and then the others at gradually taller intervals. Since my seed starting is spaced out, I can move the trays down to taller shelves as I go along.
Another plus is that you can loop/hook the chains for the lights through any part of the shelf--doesn't have to go at the ends of the shelf.
And if you consider a taller unit, keep you ceiling height in mind! My basement has a much lower ceiling height than the main floor, so a taller unit down there was out of the question.
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