It looks like you've done all the right things.Interesting
I did think I had bought a reliable brand (energizer same as the battery)
light is rarely on more than a few mins at a time and it’s outside so heat shouldn’t be a problem
but having to replace a whole fitting, (metal with a heatsink on the rear) in about the same time span as a bulb
saves nothing in the long run
Is it this one?
Surely there is at least a 12 month warranty?
If the COB/LED isn't properly heat sunk the heat builds up with a few seconds.
We used to use Metal circuit boards and big heatsinks. Our 300W lamps could only be used underwater.
Out of water they would overheat in less than 30 seconds.
Unfortunately there is an awful lot of cheap/unreliable LED lamps out there.