Checkbox vs Radio Button

Hopefully this won't be too much of an opinion question, if it is, I apologize:

I presented an idea to the UI lead for our project. I am a developer and mainly handle server-side coding, but occasionally dabble in the UI. There is a section on our webpage where the users are only allowed to select one option from a group of options (in our case, brands, when filtering search results). From this group of options, the user may only select 1. That is, if you select 1, any other selected choice is unchecked.

The UI developer implemented these brand choices as checkboxes, and I suggested that they be implemented as radio buttons, since only 1 can be selected from the group at a time.

For some reason, I always associated checkboxes with multiple choices allowed (usually), and radio buttons were used for things that were mutually exclusive, only 1 could be chosen.

Is there any UI/UX design standards or conventions that supports my stance, or am I wrong, is this simply a preference? The UI designer seemed to think that I was way off base in my suggestion.