The 23W model has a lifetime problem, both many switching cycles, as well as more easily heat buildup lampshade are very bad for the life. So I do not mean a 100 ° C on the mount but rather 60-70 ° C, which are completely normal and must be easily handled by the electronics.
In the kitchen with about 30 switching operations a day and switch-on times of 1-60 minutes in a closed up lampshade - no longer than 3 months, the bulbs quits. Since I did not want a light bulb back, now shows an LED that may be a better way.
Above the desk with 1 shift a day and switch-2-9 hours, the last has now after 10 months acknowledged their service, the first had already after 3 months no more desire.
This model disappointed me as a so far very satisfied Philips customer very.
The shelf life is so far only ok if the lamp house is well ventilated, or the switch-on times are so short that there can be no heat build-up. Too many switching cycles per day but again bad either ...
The warranty I have partially taken up, after the second three months corpse can be seen, however, that here there is a fundamental problem and the RMA process is a waste of time.
