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You guys and your yellow fever...
Why do you figure that, as far as I know, no manufacturer uses the superior yellow film on their fogs? If automotive engineers thought it worked much better, it should be more common right? I believe its because you can eliminate blue light without having to use a yellow filter, and the lower placement is what cuts through the fog using narrow spectrum white light.
I'm the kind of person that believes that bulb technology has changed and that the very low angle of the light is what affects refraction to your eyes.
The color spectrum HAS changed with bulb technology is my argument, and that the blue spectrum was the big culprit.
You can control whether your light source is broad or narrow spectrum, avoiding the blues without having to resort to yellow filters. Manufacturers understand this, which is why yellow is almost never seen in modern vehicles, and often only added these days for the retro/rally/racer aesthetic.
You have to decide what you're even arguing for though... If you want to reduce your brightness or "intensity", then just put in lower lumen lights. We were talking about refraction which limits penetrating power of the light in fog and the like, and while red and yellow has reduced refraction angles, my argument, which it seems pretty much every OEM agrees with, is that if you keep your fog lamps way lower than your line of sight (as they certainly are on a Ram) and don't pump out a lot of light in the blue spectrum which is on the opposite side of the wave length extreme, you get brighter light that can still penetrate with little refraction off the droplets back into your eyes.
You have to decide what you're even arguing for though... If you want to reduce your brightness or "intensity", then just put in lower lumen lights. We were talking about refraction which limits penetrating power of the light in fog and the like, and while red and yellow has reduced refraction angles, my argument, which it seems pretty much every OEM agrees with, is that if you keep your fog lamps way lower than your line of sight (as they certainly are on a Ram) and don't pump out a lot of light in the blue spectrum which is on the opposite side of the wave length extreme, you get brighter light that can still penetrate with little refraction off the droplets back into your eyes.
Or, what is also possible, is that all the automotive engineers at Toyota, Honda, FMC, Ford, etc. don't know what they are doing and you should write an email to their CEOs and demand they all be fired.
BTW: I skimmed your source and it says that many OEMs use yellow in their fogs. To attack the credibility of your source, go ahead and list the top 5 vehicles in 2019 that you can get with yellow fog lamps... I won't hold my breath.
There's a good reason leaded fuel was abandoned, as were laws requiring yellow lights/fogs, and why both are hasta-la-byebye.
Like 99% of people on the road do.
There's a good reason leaded fuel was abandoned, as were laws requiring yellow lights/fogs, and why both are hasta-la-byebye.
Like 99% of people on the road do.
The way I understand it, different wavelengths have different refraction angles.
Red has the lowest refraction angle, meaning the light can be shining closer to your eye level and is less likely to scatter back from the droplets. Blue has the least, and so would refract the most... those blueish HIDs, not great, I agree.
Manufacturers tended to believe that between 4300K-5000K is the best compromise between what your day and night vision can see (rods and all three color cones in your eyes active), and low enough wavelength to penetrate fog when mounted low on the vehicle far from the angle of your vision (which is why high beams are bad in fog as it puts light right at eye level droplets instead of just pointed down).
Yellow, like red, isn't picked up by all your rods and cones well and so will seem dimmer, thus slightly inferior, and why even the cheese eatin' surrender monkeys admitted they were wrong.
