CHIP
Power Supply
BETTERhttps://www.ebay.com/itm/10W-20W-30W-50W-100W-Waterproof-High-Power-LED-Driver-Supply-LED-SMD-Chip-Bulb/162000234100?hash=item25b7f76674:m:mrAkcjQIpzv6_W3UHOODO7A- Make sure (4) 3.5 chip screws are not stripped or bottomed out
- Insure flat chip mounting surface. I like scuffing with 80 grit
- Use SILVER heat sink compound -- it really does lower chip operating temp.
https://www.ebay.com/itm/Top-Quality-SILVER-Thermal-Paste-Compound-For-CPU-GPU-Block-Heat-Sink-4-5w-MK-1g/252492064905?hash=item3ac9b32889:g:mpgAAOSwARZXpf6GAfter repairing several dozens of these lights, I seem to have ironed out the bugs. None of my upgrades have failed in 6+ years...
But none of the above addresses the issue of dimming. Use a 5-watt chip and matching power supply?