0
From the mid 1930s to the early 1990s, France required all headlights, driving lights, and fog lights to produce yellow light rather than white. This was originally done at the request of the military, which wanted to be able to identify French-registered cars after dark. Later, French engineers and scientists determined that the special yellow color they used, called "selective yellow", reduced glare from car lights. The requirement for yellow lights in France was dropped in 1993 because it was out of line with pan-European standards that called for white headlights. Other countries that permit yellow headlights in the past (some of them still do) include Japan, New Zealand, Brazil, and various former French colonies and protectorates.
Modern studies show us that compared to white light of equal intensity, selective yellow light can reduce glare and improve bad-weather seeing. The French situation did not really fulfill the "equal intensity" condition, though; the headlamps in use during the yellow-light period were relatively primitive and their output was rather low. Adding a yellow filter to the bulb or lens glass reduced their output by about 10% to 15% versus an unfiltered white light. So, a chunk of the glare reduction experienced in France was simply due to lower intensity reaching drivers' eyes.
There is more detail in two articles linked below.
What else can I help you with?
How can you get the color yellow by mixing colors together?
If you're referring to pigments (absorptive color), you can't. Yellow is a primary color. If you're using light (transmissive color), use red and green.
How do you make the color yellow without using yellow?
Considering that yellow is a primary color, there isn't a way to get true yellow without using yellow. You might try mixing brown and white or orange and white, but you won't get an actual yellow as more of a burned umber color.
What is a sentence using the word amber?
The mosquito was stuck in the amber. (hardened tree sap)An amber light means caution. (the color yellow)
What is the colors to equal green?
If you are mixing paints, cyan (light blue) and yellow make green. If you are using lights, green is a primary color.
What makes red color?
there is no color combo that makes red. it is a primary color. the color red is actually light reflecting off the obect.
What color do see when red and green are reflected?
When mixing paint (subtractive) red and green gives a brown color. When red and green light are combined (additive, e.g., using diodes) a yellow color is seen.
What two colours mixed together make green?
Blue and Yellow = Green when mixing pigments. When using light, green is a primary color.
What colors of light must be combined with blue light to obtain white light?
Red and green light must be combined with blue light to obtain white light, using the additive color mixing process.
What colors do you mix to make yellow?
Yellow can be mixed with the colors on each side of yellow on the color wheel - orange and green, but beware - it will be a very dull yellow, and probably darker in value than you want. This is why, in painting, yellow is a primary color. It is a very intense color of very light value. The colors you would try to mix it from - orange and green - are both darker in value and less intense. This is why the resulting mix is darker and duller than primary yellow. So if you want a light, bright yellow, you won't be able to mix it using paint.
What color should I decorate a baby shower for boys?
You can always go with the standard light blue, however I'm seeing more boy baby showers that are using light green, light yellow and even browns.
The seven color groups in the light spectrum are?
The seven color groups in the light spectrum are red, orange, yellow, green, blue, indigo, and violet. This sequence of colors is often remembered using the acronym ROYGBIV. Each color corresponds to a different wavelength of light, with red having the longest wavelength and violet the shortest.
How can I create a gold color using colored pencils?
To create a gold color using colored pencils, start by layering yellow and brown pencils to build up a rich base. Then, add highlights of white or light yellow to create a metallic sheen. Blend the colors smoothly to achieve a realistic gold effect.
