I've completed the whole campaign on legend, played solo and didn't get any rewards over 1500. Every reward up to 1500 and then they stopped at 1500. Yes it was legendary, got 2 chests after every mission. The only thing I got over 1500 was a random exotic pair of gloves. Great way to level up, if you ask me.
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The campaign will stop giving you +light loot after you reach 1500. The exotic armour piece that you will get for completing the campaign will drop at higher light. Its a good way bungo has done this.