A modern LED panel is light. The weight comes from the inline fan, a carbon filter (a big one weighs several kilos) and the ducting pulling sideways. Spread the load over more than one bar, hang everything on rope ratchets or straps over the frame poles, and keep the ducting supported so it doesn't drag on the tent.
If a manufacturer gives no load rating, treat the top bars as suitable for the lamp only and put the fan and filter on a separate support. See tent accessories for hangers and straps.
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