A bulb is estimated to last for 22.8 years if used for for 2.7 hrs every day, with the lifetime of a lamp said to be 25,000 hours.
..and I'm sure there's another bit there saying as long as the lamp is fitted in the upright position like in the pictures, so that hot air will flow from the base of the lamp to the ceiling.
translation.. they used 125-130c capacitors inside with about 2000-4000@130c rating, and the electronics inside will probably run at around 70c .... hence the 25k hours rating.
This channel :
https://www.youtube.com/user/electronupdate/videos has reviews of lots of led lamps available in US and Phillips are indeed some of the better ones, using good ICs that don't cause a lot of flicker.