Why are the car tail lights red?
First of all, from an optical point of view, red light is the longest transmission band in the spectrum, so we can see red objects far away, and because red light has strong penetrating power, it is the same in fog and rain. Eye-catching.
Secondly, from a psychological point of view, red has a warning effect and can form warning hints in the human brain, making it easier for people to be alert. Therefore, not only the taillights of cars, but many warning or prohibition signs in life are all Red.
In summary, the reason why the taillights are made red is to make it easier for vehicles behind to perceive the vehicles in front, and to generate vigilance and improve safety awareness.
Why is the car turn signal yellow?
First of all, yellow light is light with strong penetrating power, so it is not afraid to be invisible in rainy and foggy weather. After all, the turn signal is an important tool for predicting vehicle dynamics. In addition, just like traffic lights, be careful when you stop red lights, go green lights, and yellow lights. Yellow lights can serve as a reminder.
Secondly, this is related to the car manufacturing regulations in various places. Regarding the light color of the rear turn signal, red or amber (yellow) is allowed for American cars, and amber (yellow) is mandatory for European cars, while Chinese cars have regulations for lights. Basically the same as the European regulations, yellow is applicable to a wider range of regulations, so most cars use yellow turn signals.
Why are the daytime running lights white?
Daytime running lights are a new type of vehicle lights in recent years. The main function is not to illuminate, but to give vehicles higher visibility during the day, thereby reducing the occurrence of traffic accidents.
The role of daytime running lights leads to two requirements for the light source:
First, the brightness is high enough to be eye-catching in the daytime;
Second, the energy consumption is low and it can be in working condition for a long time;
Therefore, LED light sources have become a better choice, so most of the daytime running lights we see now are LED light sources.