i havnt been able to find any definitive answer to what the etheric lights will be used for in The taken king. im sure many other ppl are wondering this same thing. so will someone credible or BUNGIE themselves plz give us a heads up about what we should do with our current etheric lights. lets move this up the board ppl so we can get some answers about this.
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Luke Smith mentioned in an interview that there's no plan for trading etheric light in yet, but said that Bungie will look into it shortly after release. Take that for what you will. I'd vault it and forget about it for a while, and go into TTK with low expectations...