How do I select which lighting does specular highlight?

Unity Engine
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1

I would like one light source to have specular highlight, and the other not.
How do I selectively enable specular highlight instead of enabling and disabling for all light sources?
Do I need to edit the shader and somehow recognize which light source the shader is running on?

2

You can set a light to be non-important, which means it’ll be a diffuse only per vertex light with no shadows and a slightly different falloff than regular per pixel lights. Otherwise no, there’s no way to disable specular on a per light basis, only per material.