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A little extra clarification from an optical point of view but keeping it simple.
Approved vehicle lighting was designed prior to LED to match the exact filament location, and to reflect, usings the fittings internal reflectors, in combination with its lens to focus the light in very particular pattern and direction.
LED’s do not directly replicate the same filament location, so the lighting pattern and direction will be very different.
This explains why swapping filament lamps for LED is unadvisable.
More modern replacement fittings designed to use LED lamps have significantly different internal reflectors and lenses. Which must be mounted at particular angles in order to meet the necessary standards.
As stated its highly unlikely that your vehicle will fail an MOT, but that is the lowest possible requirement for vehicle external lighting.
A little extra clarification from an optical point of view but keeping it simple.
Approved vehicle lighting was designed prior to LED to match the exact filament location, and to reflect, usings the fittings internal reflectors, in combination with its lens to focus the light in very particular pattern and direction.
LED’s do not directly replicate the same filament location, so the lighting pattern and direction will be very different.
This explains why swapping filament lamps for LED is unadvisable.
More modern replacement fittings designed to use LED lamps have significantly different internal reflectors and lenses. Which must be mounted at particular angles in order to meet the necessary standards.
As stated its highly unlikely that your vehicle will fail an MOT, but that is the lowest possible requirement for vehicle external lighting.
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