That's correct about mixing technologies.
A parabolic reflector is like a TV antenna - it's good for collecting waves incoming from a given direction into a single focal point, or emit parallel waves from a focused point source (same thing, just reversing the direction of waves). The reflectors in our halogen headlights are not technically parabolic ones, but serve the same purpose - produce a collimated beam of light from a point source. Filaments in light bulbs glow on a very short portion of the wire, they can be considered a good approximation of point sources of light. Those "+100%" premium bulbs that use the same number of Watts? They're more "pointy", which lets them better use the reflective properties of the housing (the side effect is that since the energy is focused on an even shorter length of the wire, it burns out quicker).
Now a LED "replacement bulb" shines with a stripe that's long - like an inch or so. Or a couple of such stripes. That's a very poor approximation of a point and thus the reflector doesn't work - it's impossible to get a good beam.
I hear some projector housings may be better with LEDs (even though those also have a focal point and lenses "like" a point light source), but it's a hit and miss. Please don't put LEDs into any reflector housings that weren't designed with them in mind, this will almost always end with you not seeing much at night and blinding other motorists at the same time due to a scattered beam.
Having a nice color of the headlight is not worth it.
2015 Versys 650