A couple of years before the covid I got the 2 foot led grow lights from walmart and glued magnets from old pc hardrives onto them so I could stick onto the underside of metal shelves.
Initially I was able to keep them around @18 inches,but I think over time they are getting weaker.I put them on top of the clear cover seed starting trays until the plants hit the top,then transfer the trays under my 4 foot grow lights.
Those are 18 or 20 inches above the plants.
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