Also I tested the color of lights and there it works like expected, no brightness change by saturation change, only emitters shows a wrong effect.
PS: I need one developer for me and my hundred posts. Sorry. 
@Micha Darker and less saturated lights seems to be darker, light black light. We’ll have a look at it.
Thanks, it’s difficult to adjust at the moment. Every color change needs a readjustment of the brightness. Good luck.