If you do decide to desynth darklight accessories, Brayflox (Hard) and Halatali (Hard) are both excellent sources. In both dungeons, parties usually skip the chests that have accessories in them. Wait for the run to be over and everyone else has exited the instance, then run back and claim the chests. (The monsters around the chests will probably kill you, but no biggie as long as you manage to open the chests first.) Lost City of Amdipor is a bad choice, as the accessory chests are right along the path, so parties usually open them as they pass them.