Baking Textures only bakes teture information, not lighting information. Most good game engines should supply lighting ingame. There really should be no need to export lighting. Its the game engine that matters. Research what technical specs the engine provides to know what you do and don't need.
Chris (formerly R@nSiD)
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When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)