Any way to change lightingmap in runtime???

Unity Engine
1

I have a scene. And I want it to have sunlight and night shift effect.
So I prepare two light maps, one for sunlight and one for night.
Any way to change it in runtime??
Any api reference??

2

Came across the following free asset on Github.

https://github.com/guiglass/Lighting-Scenario-Switcher

Here is the thread that led up to it (fourth post has the working prototype before it reached point it is on Github).