Your light level matters, not weapon level at all.
I can take a khostov on a 34 and do CE, I can't take a Gally on a 20 and do CE because it'll do 0 DMG.
They won't do as much damage, but they'll still be better depending on situation of the game.
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Yes your right but if you've looked at TTK footage weapons have a light level attached to them..... Therefore you'd be under-leveled by taking in guns that didn't have a light level attatched to them... Hence going along with both our analogies you would reach a point where your light level wouldn't be on par with enemies and you'd do no damage..... This is unless bungie changes that part of what they've shown us