I am having what I think is probably a common problem. I cannot store all this #@!& etheric light. I have begun scrapping it to make room for all my faction ships and shaders. Those are a whole other problem that I will save for another post. Please sign if you would like bungie to make etheric light harder to obtain therefore saving our vault space. I believe we need a solution to this epidemic.
Edit: I have begun to develop carpal tunnel syndrome from all the time spent discarding it. :(
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You could always use it.