You have to upgrade your legendary armor. Every time you upgrade your defense for your armor your light lvl goes up. You probably only need 3 or 4 more defense upgrades to get to rank 28. In order to get to lvl 29 you will need at least 1 exotic.
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Thanx DarkSaint. I will try getting some ascendant shards to do the upgrades.....
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Not a problem. The easiest way to get ascendent shards is to but legendary armor and dismantle them. That is Tue quickest way that I have found.