QUOTE(4EverLost @ Dec 8 2010, 23:05)

need a robe to mess with?
Yeah, if someone could let me borrow one for a day that would be cool. It doesn't even have to be that good. Maybe 20 proficiency.
On an unrelated note, I'm convinced now that equipment levels actually have hidden decimal values and IW clears have a set fractional level increase for each difficulty.
Based on experience I would say Normal is definitely 1.0 and Hell is 2.0. From that you can extrapolate some numbers for everything else. I would say they're something on the order of:
Cake: 0.5
Easy: 0.7
Normal: 1.0
Hard: 1.3
Heroic: 1.5
Nightmare: 1.7
Hell: 2.0
Nintendo: 2.2
Battletoads: 2.5
Again, they're just rough guesses. I don't think I've ever actually played any IW on Cake, Easy, or Nintendo.