Ive been fiddling with half a dozen versions of these, feit and philips, for some years now, it extreme wet, obvious vibration, and obviously horribly ragged and variable current coming of a moped lighting coil unregulated. All i have is anecdotal, but honest. Not a single failure.
Only real weakness, again, is that the beam is circular instead of more properly spread along the horizon like a true road lamp should be. But if you find that its going to be hundreds of dollars, and not the price of a good cheeseburger like these are.
This is the one thats been burning brightly in my taillight for as many years now without a hickkup
The latest versions of these at home depot are potted on clear silicone soft rubber and you can see the little circuit board driver under the leds. (edited)