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For tail lights, you're not really trying to illuminate anything, you're just trying to make your presence known. So, you don't really need a huge viewing angle for them. I would go with the higher mcd rating, unless the angle is only like 5 degrees on them. I think most are around 15 degrees though, so a high mcd with that should be alright.
Make sure they're not too bright though, you don't want to blind people at night.
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