I'm only loosely familiar with that brand. I start seedlings around 30". I watch the leaves as they will tell you if there is too much light, too close.
My cobs right now are in the 28" - 30" range. They are super bright, so you might want some eye protection or at the very least wear a hat with a bill to block those bright lights. Each strain has reacted a little differently to the cobs.
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