Etheric Light is going to be rare as hell. The only ones that will get them are players that have a group of friends and 1) Do level 30 and above POE and The Trials of Osiris. Once again lack of matchmaking will exclude the vast majority of the player base. The only hope for the rest of the 81% of Destiny players will be to wait for the Iron Banner and hope that RNG favors you at Rank 3 and Rank 5. Otherwise you are going to see a huge amount of player at 32.5. That being said perhaps Xur should sell it one a month for a very high price.