I have a 3D scene with AmbientLight. And I want to add a second SpotLight to illuminate the area with red. Unfortunately AmbientLight is much brighter than Spotlight, so it is not visible.
The way to change the intensity of AmbientLight in WPF is to change the color. If you want the light to be less intense, you simply set it to a dark color (ie, Gray instead of white or navy instead of blue).