Halogen Vs LED Fog Light Illumination Very Dark Roads

Question

I have a car that came with yellow Halogen Fogs as standard in Japanese. In Kenya we use fog lights a lot at night because our roads are barely lit even in cities, barely painted and lots of obstacles from unmarked bumps including mountain ones to potholes.
I tried switching to LEDs (Philips Ultinon Extreme) but it appears when they light wider than Yellow Halogen Fogs such that I can see the end of unmarked roads, they are poor at illuminating the road directly Infront such that I only see obstacles at the very last minute without my full lights.
Visibility seems to be better after I switched back to standard halogen fogs. I am wondering if this is expected behaviour of the 2.

GdD · Accepted Answer

Headlights and fog lights have a parabolic reflector that is shaped to shine in a cone ahead of the car, the light source has to be in the right position to focus correctly. Think of a magnifying glass, as you move it closer or farther away from a light source the focus changes, the same principle applies here. Most likely the LED replacement is shorter or longer than your halogen light, so the LED light is father from or closer to the reflector, changing its focus. The technology isn't the issue, LEDs will work fine as long as you get the right one.

Correct answer by GdD on September 25, 2021

lil_king420 · Answer

Automotive headlights have for the most part historically, designed explicitly with halogen bulbs in mind, as standardized by the Federal Motor Vehicle Safety Standard 108 in the US, Canada and New Zealand, and by the United Nations Economic Commission for Europe (UNECE) for most of the rest of the world.  The wiki article on Headlamps is especially informative
Here's an article that helped in my own understanding this question;  https://jalopnik.com/why-most-led-headlight-upgrades-dont-really-work-an-ex-1843070472 lots of good links in the article too.
Like @GdD said, LEDs can work as halogen replacements, you just have to find the right bulbs for your particular application.

Halogen Vs LED Fog Light Illumination Very Dark Roads

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