Review on 🚦 ECOTRIC LED Trailer Marker Lights: Super Bright 10 Diodes, Red/Amber Indicator, Double Bubble, 12V Rectangular Surface Mount for RV, Camper, Trucks - 20pcs (10Red+10Amber) by Charlie Wilson

The picture shows what appears to be corrosion or flux residue on and around several SMD LEDs. I bought it in April 2019 and only installed it on my motorhome at the end of May. 2019. Residential building is covered from late October to April. Fast forward to Spring 2021, having left the camper for most of 2020, I found that only 1 LED remained lit in the light shown in the attached image. During installation I used silicone sealant at the cable entry points and around the mounting screw holes. There is dust on the inside of the lens, so I suspect the cap seal was broken in some way, but I don't see any gaps or cracks. I wrote to the seller 5 days ago, giving enough time to answer this question, but no joy. I gave "2" stars because the other LED lights I've installed so far still work. I'll have to check the rest of the headlights up close to see if they have the same defect. It would be really cool if they came with foam or rubber pads that fit between the light and the surface when mounted. I was really hoping they would last longer than 2 years.