I have tried modifying all the settings suggested that I can find, but the lighting of objects in my Scene remains unchanged. I've used the "Generate" button, I've set "Intensity Multiple" to 0, I've enabled/disable Scene lighting, I've set the Environment Lighting to black, there are no lights in the Light Explorer, etc.
I want everything but the Canvas HUD to be completely black, except anything illuminated by manually added lights. Is there some way to do this in the latest Unity that I'm somehow missing?
Edit 2: I have changed the material of my sprites, and now there is total darkness, except when I place lights. I changed the Rendering Mode of the material to Fade to fix the HUD being blocked from viewing by the tiles, and now the problem is that a light placed as a child of the player is causing the player to appear as a purely black version of his sprite.