That's what I've heard, but I don't understand this whole "add light to your armor to raise your level" nonsense. I guess I'll have to figure it out when I get there. I play on Xbox One.
Higher level armor has a "light" statistic on it. With enough of it your level will increase beyond 20. They're changing the way the leveling system works though and you will no longer require light. Not sure exactly when this update (I believe it's the next expansion) will be available though.