I did not know this before I found a write up on it. I will just use the H-11 as an example. All H-11 lamps are not the same as to the projection pattern, it has to do how and where the LED's are located on the lamp base. I do not know enough to really explain it but I read something about it last year. If I remember correctly they vary according to the type of base that they are to be used in and some will be brighter than others.
One of the biggest problems is the lack of consistency on length between all of the LED bulbs out there.
All projector housings designed for halogen bulbs have a focal point where the filament is. Quite often, LED bulbs are longer than halogen, placing the actual LED source farther in the housing. While the bulb itself may be brighter, it ends up scattering the light because it is not at the optimum focal point of the housing. Basically, more light but scattered everywhere instead of focused in front of you.
There are some better LED bulbs that actually have a little allen head that allows you to adjust how deep the LED bulb sits in the housing. I put a set of these in my wife's car and adjusted them. These work awesome. Or, you may get lucky and find a fixed one that is the same length as a halogen.
With HID bulbs, even when the bulb is longer, the filament is also longer. So, there is still the maximum bright spot in the focal area. Although, most that I have used are almost identical length as the halogen equivalent.