Incandescent bulbs were mostly phased out a few years ago, but we have an odd little cabin holiday that's pretty much a time capsule of the late 70's so I kept using them there to keep the retro vibe. Since it's empty most of the time and has electrical resistance, incandescent inefficiency isn't a problem anyway. Unfortunately, lightbulbs aren't what they used to be, even for prestigious brands like GE. It seems they have a problem with the quality of the connection between the lamp and the metal base. The filaments in all are intact, but the first one I tried only ignited one of the two filaments. The next worked fine for a couple of hours, but then it became intermittent, flickering, and then again at random times. The next did the same, except it was the smaller of the two strands in this one. The 4th has been fine so far, it has probably run about 50 hours in the table lamp and both filaments are working fine. I understand that vintage lightbulbs are a niche item these days, but it would be nice if they took a little more pride in making a quality product. With over 100 years of perfection and mass production, a 6 bulb pack should consist of 6 bulbs that will perform flawlessly throughout their lifetime.