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There is a function for such cases: SetCombatAmbientLight("path to the lighting file")
Hmm... I didn't find it in the manual. If I write it in the script at the very beginning, will it change the lighting for all subsequent battles on the map?
Added 2 minutes later
Any -- meaning that launching StartCombat is not an option? Well, you could create a mod to change the standard correspondence between arenas and terrain type.
Well, creating a mod is a bit difficult for me right now. Thanks anyway! If I don't find another solution, I hope to learn more about mods from you.