The LEDs are tightly screwed so that they can not replace. Should break sometimes a, you have to dispose of the whole lamp. I prefer to buy a sustainable and am not willing to throw away the whole lamp just because a diode can break times. Not to mention that you also have thereby not the possibility of using LEDs with a higher or lower number of lumens.
I'm trying it now with the yo-yo pendant lamp by trio. Since you can reinsetzen normal E14.