You need to replace the proprietary LED puck for that specific fixture. Some cheaper fixtures you can change out the diodes easily with a soldering iron. which is gradual temperature rise over a longer period of time, and then matched by the cooling time.
It's also one of the reasons these lights are higher end.
LED lifespans make me laugh because it's almost a false rating.
It's only to get people who don't know any better to buy something they think will last "forever". This is coming from your sometimes friendly Electronic Engineer(me).
And if you wanted it to last 50% longer it would have to be 8/16 which would add 4 addition hours but drop the % by 16 so I don't think that works out.... Only logical conclusion, unless they are programmable.