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First gas discharge bulbs are nearing end of their life, so we test eight standard and upgrade HID bulbs
From this, I read it as replacing xenon bulbs in cars that came factory fitted with a standard (like for like) replacement and a upgrade (brighter) replacement, not a halogen conversion.
The whole HID/Xenon thing is about as clear as mud. I am sure people talk about one when they mean the other or are both meant to mean the same thing, is a HID by default a Xenon and vice versa or is the "HID" referring to conversions where "Xenon" is referring to OEM supplied lights.
High intensity discharge is the common technology name. This is often called Xenon because of the xenon gas used in the gas discharge tube. They are generally used interchangeably but there is probably a technical reason why hid is the most accurate term (maybe some use another noble gas rather than xenon?)
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