Driving light size on a 2021 crosstrek

[Wlofton]

Wanting to put amber fog lights and wondering if anyone knows what the correct diameter so it be a direct fit.

 

[Dick Foster]

Any decent aftermarket supplier should be able to help you. If not, shop elsewhere.

BTW does anyone know why most fog lights are amber? This is a test.

 

[bmart]

Yes, they scatter light less.

Funny that my blinkers lenses on my JDM wagon are clear with amber bulbs front and back, but the US ones are amber.

 

[Dick Foster]

Yes, they scatter light less.

Funny that my blinkers lenses on my JDM wagon are clear with amber bulbs front and back, but the US ones are amber.

It reflects light back less because the wavelength of the yellow light is longer so it penetrates instead of reflecting back.
This is why I generally prefer tungsten halogen lighting for cars. It's very rich in full spectrum output and is super rich in the longer wavelength red end of the spectrum. LEDs generally have very poor spectral coverage in comparison to tungsten hot filiment lamps. However filiments consume a lot of energy and have limited lifetimes. Nothing comes for free in life or in physics.