Exurtics are 280 because they are set exotics that you'll get, and are fairly cheap.
Engram Exotics are 290 because they are randomly selected, and Engrams can be difficult to get your hands on.
310 Exotics are that way so that you don't have to mindlessly grind the raid and the raid alone to reach 310 light (310 exotics aren't even a garunteed chance from exotic drops)
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Edited by Grandeurysm: 10/10/2015 12:41:38 PM310 actually are guaranteed or just have a high chance if your 305+ is what I have found I hit 306 last week and every exotic since has been 310 (could be coincidence) I'm now 307 and still getting 310 exotics so I just keep infusing my existing gear