What he's saying is the even using projector housings, the light source itself is different than what it was designed for. The LEDS have only a few points of source (as compared to a filiment). The xenon forms an arc that changes the down-street pattern. Basically, you will never get a good pattern and eliminate glare to oncoming drivers by converting to a light source not designed for it.
However if you still want to go this way, I've read several posts here and in other forums that didn't like the LED conversions as they tend to throw too much light up close and not enough down-road. (Again, they are brighter, but the projector housing were not designed for them). Note too that no OEM uses a LED light bulb installation. This stuff is all aftermarket as far as I know.
Because HID uses an arc, it's source is also shaped differently than a wire filiment. But they will do a better job of throwing light down-road. If you install a conversation, remember most are of the cheap Chinese variety and mat not be in business in a year or so. And cheap ballasts are no bargain if you have to replace it in six months.
Please do get a "professional" headlight alignment as HID conversion will change to pattern. It will benifit you and on-coming drivers. No matter how carefully you align the pattern, there is always a flare that sneaks out and hit oncoming drivers. But alignment will minimize this.
BTW, have you tried better Halagen bulbs? I was very pleased with my Phillips.
Philips H11 X-tremeVision Upgrade Headlight Bulb, 2 Pack https://www.amazon.c...a_n0x0ybRCQ9VGY