Any thoughts on the base orientation; base down, base up, etc?? I think base down reduces the heat buildup at the driver.
I had an LED failure in the enclosed fixtures on my rear deck, 17+ months (about 5k hrs). On dusk-dawn) not 'out' but dim. Bases were discolored (heat), so I think that's the issue.
A while back, I noticed this warning on the packaging, and returned the unused bulbs. Picked thru a lot of different brands & wattage equivalents, and found one (60 W Eq) that did NOT have the warning. OK, cost a few bucks more for the two-pack.
They are in for about 18 months, no issues. I have an enclosed fixture at the front entry, with a 'big box' LED that's about 2 years old; on dusk-dawn.