The light efficiency is very good and is almost exactly the (admittedly very cheap) 50W bulbs that I have used previously. The color comes from halogen lamps very close, just a touch of white. Overall, I must say that this is the LED the best I've seen so far (compare I: Philips, Osram, Conrad store brand, eSmart, Toshiba).
In the discipline of dimming I can give the full five-star of the lamp only. She does what she should. The light brightness can be regulated infinitely. Although flickering comes here and is in front, but only in very specific settings of the dimmer (pretty much a) you have to change only minimally so that the flicker (which is already almost imperceptibly so - only when you look directly the lamp) stops.
With dimmable LED lamps, however, a very important point to note. The built-in dimmer usually have a minimum power that must be queried with them (usual 20 - 30 W). With an LED lamp (or more) below this value very easily, which may result in the dimmer does not work anymore. In my case, six Philips lamps have not been enough, so I just put a normal halogen bulb can.
This consumes virtually no power more, since the LEDs will still be bright when the halogen lamp is long dimmed very far. Over here I come to my only criticism I could find on the Philips lamps. The lights are beautiful bright and dimmable what extent really great. Unfortunately, the area is distributed to dim very uneven. If you turn up the dimmer at the top of (almost full brightness) then change the LEDs only barely their brightness (during conventional halogen uniformly darker). Until the last third of the dimmer the LEDs are evenly dimming from very light to dark.
If you can live with the phenomenon described above (is not really schlim) is the MyVisions Philips (especially at the good price) do well.