Interesting reading, since increasing saturation in Twilight, but of the lighting only, has been a question of mine as well. I am not doing architectural renders, but special events, which sometimes requires soft lights and other times I need the sharp almost neon lights that go along with these types of events. For example, spot lights under palm trees in the Bahamas and which totally light up the underside of the fronds with a bright highly saturated light. For this reason I prefer the saturation settings in LightUp which gives you some really vibrant colours.