how does lighting/vision work?

[Brent Not Broken]

I guess in most situations, it's pretty intuitive, but I have questions about how lighting works with certain abilities, like Doomed's Creeping Darkness and related talents, the Armor of Shadows prodigy, and stealth. I'm perplexed how tiles can show as "Lit" under mouseover, whether or not Creeping Darkness is applied to them. (And how it's sometimes tough to tell where the boundaries of Creeping Darkness are, since the mouseover doesn't seem to indicate whether a tile is affected.)

Is there no real synergy between CD and Armor of Shadows, besides the fact that you're dealing Darkness damage? You're not actually unlighting tiles?

Is any of this affected by the light source of your equipment?