Cold could be the culprit.
When it's very cold here (below 25 or so), one of my rings isn't as bright as the others. When it warms up, there all fine.
But keep in mind this is a relatively new thing, and there are a lot of manufacturers that make cheap crap, with poor quality control.
What kind do you have, where did you get them, and where they new? Also, did you get all new headlights, assemblies and everything, or just adding the rings to your existing headlights?
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