Creating day and night environments in AR

I am working on a project in AR which shows the concept of power generation from Solar and Wind. I want to show how changing the “time of day” effects the power from Solar. What should I do to distinguish daytime with night so that the experience looks alive ?

I have some thoughts on showing the daytime using the Bloom Effect on the Solar panel models, but I am not how to represent the effect of Night.

P.S : This is a client project so I will not be able to share the project link.