When i go see the requirements for buying the exotic helm of innermost light, I see that you need an exotic shard and 7,500+ glimmer. The confusing part is that the last required item is the helm of innermost light. This doesn't make any sense?
How can you get a helmet that is needed to get the same helmet. (I'm a level 24 Titan if it helps)
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Just to add to what others have said, once you do get lucky and get the helmet, it will be the 2.0 (post TDB DLC) version. If Xûr ever offers an upgrade for a better version (ie. with a higher stat buff) you can trade in a 2.0 for a 2.0 to get the "better" version. For example, I had an Exotic helmet purchased from Xûr post DLC. After a week or two he offered it in his upgrade section and it had a higher stat buff, so I traded it up to the better version. Hope that makes sense.