I think you'll find this is perfectly normal, led's do not produce any light in the radiation range that causes oxidising of the lenses, meaning there is practically zero UV or IR rays. What you are seeing is just dust reflection, dust will be present because the lamps have vents to reduce condensation...
https://www.hella.com/techworld/uk/T...eadlights-833/
My Audi A4, with matrix headlights, did the same..