Lights seem to "leak" thru holes in P4. I've had this problem lots of times, for instance with my Cargo Box (Free Stuff) which is also lit up inside at certain angles. I seem to remember that someone (geep?) posted an explanation/solution to this, regarding my box, but I can't find that thread again, so I might me imagining things :o( Is the hat solid inside?

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.