Well (and this is personal) hate eyeballs and never use them. (I might if I was going for a retro look) The slot aperture is my favorite, mostly because it does not show much, especially if painted the ceiling color. They also do not shine in your eyes. 30" would work for an eye ball or one of the adjustable pull down trims. But if the ceiling is 8' high, a wall wash or slot will not adjust up high enough to hit art. Now the higher the ceiling, the farther away from the wall they need to be. I go 6-8" more for every additional foot of ceiling height. In this case, not too many basements have high ceilings. And I am in California, so I have never worked in a basement!
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