Dimming has been the most disappointing part of LED for me. In reality, incandescent and fluorescent bulbs dim too, but not to the same degree. I spent a long time searching for LEDs with warm light and high CRI values. They look fantastic at first, but they seem to lose a good chunk of brightness in the first month or so and then a much slower drop off after that. I haven’t measured it with a light meter, but that seems to happen in my experience. As far as longevity. I had to replace one bulb in the past 6 years. So mine have held up just fine and we have our lights on quite a lot because of the dimness of our house.