Mazda3 2.5T HID Ballast Necessary?

I was planning to upgrade my halogen bulbs to hid bulbs and I'm planning to get it online. In a blog post, they have mentioned it is necessary to have ballast along with hid bulbs.

Does anyone have any idea about this? Please advise.
 
You absolutely need ballasts to drive HID bulbs.

With that said, since you used the "2.5T" prefix in your thread title. I'll assume that your car is a 2021 Mazda3. According to MazdaUSA.com, all 2021 Mazda3s come with LED headlights, from the base 2.5 S trim all the way up to the 2.5 Turbo Premium Plus. Here is a screenshot of the trim comparison from the site:

Capture.JPG


As I understand it, the LED headlights Mazda uses are not bulbs that you can replace or upgrade - the "bulb" and housing are all one unit. If you have a 2.5T Mazda3, it looks like you have the best headlights for the 3 available from Mazda, and there is nothing to upgrade them to, unfortunately.
 
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