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Done:
Done - Add changing of time dusk, dawn, evening and morning
Done - Add changing of day length; Shorter days -> darker nigths
Done - [Add changing of solar panels effect, there is surface.solar_power_multiplier and I can add for shorter days lower power output]

Todo:
- Config for length of nights changing
- Config for solar panels efficiency

This mod can be interesting with:
Light Cone - new torch light with longer distance and bright spot
Black Map - the fog of war will be black, you cannot see old revealed areas

Afraid Of The Dark - better lamps and lights for your factory

Lightorio - little glowing for production machines

Inbuilt Lighting power poles have light inside

Alternative mod for dark nights is Alone In The Dark - you can choose the darkness and freeze the night forever.

Alternative mode: https://mods.factorio.com/mod/Clockwork