Best way to glimmer farm in my opinion is also the best way to farm exotics. You can do both at once. The mission where you kill draksis (winter kell) Get to the throne room on the ketch, and kill all enemies in the room, leaving draksis for last. Make sure you use ether seeds. Get draksis low, low enough to use a rocket launcher on him and yourself. When you both die you start the room over right after that. Even if you don't get many exotics, he drops house banners all over the place. With the house banners and ether seeds this is the best spot to farm glimmer in my opinion.