Exactly!
The main problem with replacement LED bulbs is
lack of focus when fitted into originally designed light assembly for incandescent or halogen bulbs. See examples below.
LED light source in not so tinny as filament wire, so you will get much light where you do not want. Many cheap LED bulbs also do not care about placing LEDs even close to focal center, so you get almost no usable light.
These ones were really awful. Thrown light all around, actualy transformed my driving lights into DRLs, with absolutely no value at night!
I even tried these from eBay, claimed to be CREE, but still no go. Beam was much better than with above ones, but still way out of focus, no cut-off, just a lot of light everywhere:
So, go with HALOGEN or buy quality HID conversion kit.