The boom arm can safely support up to 5 kg (11 lbs) when fully extended, provided a proper counterweight or sandbag is used to balance the load.
Yes, it features a universal 5/8" stud with both 1/4"-20 and 3/8"-16 threads, making it compatible with almost all professional LED panels, strobes, and speedlights.
Most professional rental kits include one empty sandbag to be filled on-site, which is essential for stabilizing the boom arm when extended.