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jsruck, you know that the specularity is the reflection of the light source.
So your HDRI can "generate" specularity ONLY if the light source (the sun or whatever you want) IS visible in the HDRI image.
The usual tricks are:
1) add the light source in your HDRI with an external tool (search on Google, I saw a tutorial about that)
2) to use a spotlight with only Affect Specularity enabled and the shadows disabled.
Hope it helps
Cheers Dario
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