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It's actually preferable to have a pretty dark specular, otherwise you end up with super shiny hair that looks like plastic.
There are actually a variety of specular textures, depending on the hair. Store hairs, for example, each have their own specular. The easiest way to get ahold of a specular texture is to clone a hair using
S3OC (making sure not to tick the "Rename/renumber" option if you don't want default replacements).
You can create a specular based on your diffuse, or a generic specular texture, or just a plain black square. Try different options and see which works for you.
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TS3 CAS Conversion Catalog - for basegame, EP, SP, and Store clothing!