2Dog said:I like about 18-24 inches...but it totally depends on your space and the plant.
PencilHead said:2Dog, I ain't touching that, even friskie as I feel today.
But back to point, it's nothing more than personal preference, LSTing abilities and height challenge. At 6', you'll be challenged with light shields and their hanging hardware if you go long-veg on a Sat dominant. JMO.
Luck, peace and enjoy.
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