Hows this for an ineffective UV light install?
Note that the bulb is about 2" from the end baffle, so it doesn't actually shine on any part of the coil face.

It did a number on the humidifier, seals around the blade on a couple of zone dampers, and was eating at the duct board in the plenum.
It only took 6 months for it to do this to the humidifier.