So I've been rocking a couple different auto rifles since I started playing in the crucible and I haven't seen any difference in my damage output since around 1570 I would say. It's the same 32's in yellow for headshots. No difference between 1580 and 1590 fer sure. I understand why this is. Everyone only has so much health and it needs to stay balanced, but why ever waste my precious hours and hours of MMO restlessness and channel anything into these weapons. I don't believe there is any benefit at all, but who knows. Maybe I'm wrong?
Within pvp light level has no place and has no impact with damage numbers.
Within trials I'd the only place in pvp light level has an impact.
Light level is mainly a feature in pve activities other than strikes and gambit.