After Jacktannery's suggestion I went in and fiddled with the "grate lighting" a bit. This is closer to what I was originally looking for; a sort of "foggy distant" kind of effect. I also realized that (as I often do) I dropped the grid layer down on top of EVERYTHING which is fine if you plan on walking on top of a wheelbarrow or a water trough.... This is the newest version with those issues addressed.

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