With the addition of particle effects and the general chatter about lights in TPS I thought I would conduct my own experiment for lighting and darkness. I know RCT3 took a major hit when the lights went on but I have to say, TPS is still workable with the lights on.
Here are some shots of a park I'm working on at the moment...
A Fountain lit by blue and green lights
View from inside a burger bar
This park has 3 different coasters, 2 of which have 2 trains, plenty of trees and water as well as terraforming. Whilst the fps do slow down, its not that much different between night time and day time.
Congrats to Pantera for getting this right!