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No you see, the thing with illumination is that everybody sees it. because its not like tremorsense where you have to be an earthbender to feel the ground.
I was pointing out that you can't make blocks invisible to everyone. It must be set so that at least one player can see it. Even thought if you could go over that limit, the area would only be lit to those who can see the block. Again, hence how tremorsense works.
I'm not really certain about the even option. With that, I don't think we need to make it aesthetic for non-users. Where's the fun in that, If we can make it invisible for all players?