Some questions on Summers Island by Polish

Rod Wise Driggo

As I cannot find a way to directly contact the PA, maybe somebody else can help.

Is there a way to alter lighting (like sunset/midday/sunrise) through the four sky-files which are loaded with the environment? Only things I've noticed so far is that sky4 is providing the clouds and just switching on just sky1 and sky4 makes the scene look darker (like sunset) whereas all other combinations look the same to me. Or shall I better combine the environment with other lighting? I also own the Real World Lighting from Design Anvil. Maybe that would play nice together with the island?

Thanks in advance!