The executive has always had HIDs. The early ones are reflector ones before they changed to the projector ones around 2006/7,strangely not when they did the engine or bumper changes. The are also bi-xenon ones and you should be able to see then lift with the main beam.
If you have a dark patch then it will almost certainly be the lamp. Have you removed them to check the make? Mine had some cheap ones in when I got it and they had terrible dark patches. Proper ones give a good even light.
As said above proper Volvo xenon lights are all silver and the halogen ones have black surrounds. Also the reflector xenons have the bottom part of the lamp as a flat bit rather than being all round. It’s hard to describe it very noticeable when viewed.
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