I think mine would do better in a taller tent. The two plants I am running now are the GG4 and Cheese. The GG4's main stem split very early on, and I now have basically two bushes sharing one root system.
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As you can see, headroom is rather limited. Seems to me the plants can get a little closer to a LED panel because they'll still get a decent spread of light. As you get closer to a COB, the plant falls outside of the single cone of light.
This is not a knock on COBs, just a reason that I need a taller tent.