[MikeK]

The parabolic reflector in an A headlamp produces a parallel output beam to the back of the lens, which converts that to the correct driving beam pattern.

Parabolic reflectors re-fitted with LED's no longer have the emissive source closely confined to the focal point. As a result the output beam from the reflector to the back of the lens is not a parallel beam.

You have converted an engineered assembly which produces a far reaching and legal driving beam to a non-compliant in any jurisdiction floodlight. It sure looks bright up close and off-axis, but that is not where you want the light to go!

To add to the problem, 'white' LED's actually do not produce a complete mix of all light wavelengths (colors) They only make a variable mix of yellow and blue light. Varying that mix produces warm and cool LEDs (low and high Kelvin color temperature averages).

OK, So what? . . . LED's are sorely lacking in actual red light wavelength output. Stop signs and Red reflectors ONLY return red light that strikes them. That is why they look dimmer at a distance despite the deceiving 'big bright floodlight' look that reels in the $$$ for aftermarket junk.

LED's work in modern cars that were initially designed for them by using optics far different than the reflectors designed for incandescent sources.