Don't know if this was mentioned before. I did LED conversion about three years ago so we had LOTS of hours on them. LED's typically do not fail like regular bulbs. Most likely they will start to flicker - but only in small segments - typically three leds. It is not necessary to replace them until the flicker is bad enough to bother you. I usually moved a failing one to a seldom used spot - like porch light until I got around to ordering more. Early failures usually attributed to poor/cheep design. Most are OK and have long life at 12V but some just won't last long at 14V.