Question Snow ( Specular Setup )

Hi,

What is the best method in Shader Graph for setting up a specular map ? I only want the specular effect to kick in where the lhilights are on the object ( so it appears to glitter ), but instead, I'm getting this awful black pattern where the specular map is in shadow, how can I get the specular map to only kick in when the hilight is obvious, and not show elsewhere ?

Can't find anything in the node graph for light direction or something similar that would help,

 

Oh, nevermind....

Seems I need to create a custom lighting node to get this working as required...