9000 hour LED intensity loss test on LED strings. (All LEDs do still work.)

Last year I put up a string of golden-white LEDs at the side of my house and then decided I was going to leave them lit for a full year to see how their intensity had changed and if corrosion had been an issue.
I got two sets at the same time to keep one unused as a reference.

The corrosion result is interesting. Common DC strings are very prone to wicking in moisture and corroding, so I wanted to see if the cheap sets that reverse polarity to control two channels with just two wires had less of an issue with corrosion due to the alternating current being less likely to cause electrolytic damage than DC.

Note that in this video both strings were running on DC so only half the LEDs were lit. (They use alternating polarity to flash two sets of LEDs.)

Here's the video I mentioned that uses accelerated DC corrosion to create rusty water fast as part of a quack "detoxifying" treatment.
https://www.youtube.com/watch?v=zH0QpaDNwS8
Note the angry comments from people who give these very expensive and completely bogus treatments.

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