For a furniture rendering I needed the light source reflections to be more burning while the reflection of the environment should remain dim. This is hard to do just with a fresnel node and maybe a color ramp.
But when you use a color ramp with the alpha values to clamp the reflection to the spectrum which represent the light source you can with a math add node mix in the dim result of a normal fresnel result and thus combine dull and bright reflections at once.
Works pretty well.
