Originally Posted by T- High
20 bulbs over one years time, I'm a full timer so I use the lights every night. It's a 2013 model, and I have not checked the voltage. The bulbs have 2 contacts.
Voltage won't make much of a difference, unless its extremely high.
I'm going to go out on a limb here by saying you regularly use both bulbs in the fixture and that those fixtures get hot. That heat will lower the already short expected lifespan. Then, if you travel a lot, the vibration breaks the already weakened filament.
2000 Cherokee 31BH, "flipped axles and raised",LEDs, solar, inverter, etc..aka "boondock ready". '07 Tundra 5.7L DC-LB, modded as well.