ambient light help me please

hello everyone I need help for the shader ambient light I have an idea I would like to have as to reduce the light of ambient light and to keep only texture lens dirt

I find that ambient light works as bloom it adds too much light

thanks all

Set the overall intensity (alInt) to a low value, like 1.000, and set the texture intensity (alDirtInt) to an extreme high value, like 20.000.
The slider for the second one is limited to a maximum value of 2.000, so you need to ctrl+click on it and manually type your desired value.