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UE4 Light maps

I've seen a lot of good tutorials on light maps, one of my favorites is one by the world of level design that goes pretty deep on light maps in the the Unreal engine. My question is how much space between UV's do you really need in your light maps to make them look good? In the tutorials I've seen it shows quite a lengthy amount of space between UV's, but when I look at some of UE4's Mesh's light maps, the UV's are very close together in some places and the Mesh still looks amazing. Any ideas or suggestions?

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