Ok so i may sound stupid for this but I'm pretty sure you need 120 light to be 30 right? I just fully upgraded my legendary helmet (nerigal savant III) and its only giving me 27 light. How am i supposed to reach 120 light if i already know now that i won't have 30 on each peice of armor? I saw a level 30 the other day who had 30 light on all of his armor.
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Raid set gear and exotic gear provide the 30 light needed to reach level 30. General legendary armor that can be bought from vendors cap at 27 light I believe.