Very bright ceiling lamp, ideal for the office. As daylight, it can also be very well used for brightening natural daylight, for example, if it is out a bit dark. About longevity I can not yet say, since only a few days in operation. First I had installed the lamp in my son's room, which was daylight but uncomfortable. Therefore I bought for him the same lamp with warmweissem light and he is happy. The daylight lamp is now hanging in the study.