I don't believe the lights are the same PER ZONE. It's probably a mob by mob basis. We know for a fact that Bugards can give Amber Light. My LS and I tried farming Funguars (because one of these posts on here said it was a good idea) and even though it completely sucked ass and I would never recommend it, these mobs in same zone did not give Amber Light.
Different mobs, different lights. Maybe has to do with size of the mob? I know Bats and Mandies are both small and only give Pearl/Azure. Bugards bigger and give amber in addition to pearl/azure. Theory untested, but a possibility.
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