I am not convinced there is a significant difference in pvp performance between 290 and 320.
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Maybe, maybe not. I hardly touch PVP so I don't know if Light Level has that much of an impact in the Iron Banner or Trials of Osiris as a whole. It was just my assumption since level advantages are enabled that having high light level equipment would have an impact, however if it doesn't then really it just lessens the importance of the hard mode raid items even more.