While using on Divination can save a good deal of time and some may not like fishing, I'd reccomend using them on one of your expensive buyable skills. 96 Prayer and 89 Con, Two very expensive skills to train - They may be fast XP/Hour but factor in the cash it takes and the amount you'd save using on those instead. I'd be more inclined to say Divination if you were 90+ since at that point the huge lamp saves almost an hour of training per each lamp used but it just wouldn't make sense at 76.