Whenever I install a police car mod with els, the lights are super dim. I adjusted the brightness and it worked partially. Basically whenever I pause the game and unpause the lights work super good for like a second then they dim out to almost a white color. The reflection on buildings is fine but the actual lights display an almost white color instead of the actual bright blue and red. My postfx is at ultra.

Make sure textures and shader is at least high also. Do you have radianceV installed?