[julie_m]

LED lamps are sort-of repairable -- you can get the LED modules and the power packs online. Some of them even have individual replaceable diodes, though there is a definite trend towards COB -- Chip On Board -- construction. Of course it's a question of how bothered you can be, given that a whole new fitting probably won't cost much more than mending your existing one.

I think it's fairly inevitable for some sort of standard to emerge eventually, because everyone will want to be compatible with the major brands' offerings. And I don't think standard push-and-twist lampholders are going away anytime soon, either.