Lighting shouldn't be dictated by props. This is why texture artists who make overuse of drop-shadow for their decorative elements drive me up the wall. They don't know what direction light and shadow will fall in at render time, and create potential contradictions that distract the eye and make verisimiltude less likely. The same is true with baked specularity in hair props. It's less realistic than adding your own in your application or in post-work. Having said that, of course we all appreciate Koz and his reputation for quality and generosity. I just prefer to have full control of light and shade in my work; it's one of my favorite challenges.