Greenlight, I am not understanding your terminology.
There are two types of fixtures that I know of.
1: Those that use lamps, be they incandescent or LED.
2: Integrated LED fixtures. (the LED source is part of the over-all fixture design)
I can't see how a switch from one socket to another would void the warranty from a 3rd party LED lamp manufacturer. Obviously if you are bending the LED lamps pins in such a way so to fit the wrong socket type then you may have issues, but other than that I don't think you would have a problem.