Bought these bulbs to replace original manufacturer bulbs in 2 of our 4 bulbs in our ceiling light. To date we have used all 6 of these bulbs as the original bulbs have expired. Less than a year later, and maybe even sooner since the originals didn't expire at the same time, we lost the lightbulb. So that's 1 in 6 in much less time than the MTBF (50,000) indicates. The lights are in the kitchen so they are on and off almost every day but the longest they stay on during the day is around 6-8 hours. I'll update this if we lose more bulbs or if the current ones last a reasonable amount of time. We just lost another lightbulb the other day. So it lasted about a year and a half, which is less than the original lamps that were there. So a year and a half later we lost 2 out of 6 lightbulbs. UPDATE: Lost 2 more last week (April 17, 2018). Lost 4 of 6 bulbs since purchase (11 Aug 2016) UPDATE: Lost 5 of 6 bulbs on April 28, 2018. I didn't put them all in at once as they were misaligned when the original headlights went out. . I still have an original lightbulb that this one knocked out.
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