In daily life, why is the color of LED warning lights usually red or yellow?

The air we breathe is filled with a great deal of fine residue, which has a specific hindering impact on light. Be that as it may, the impeding of light with various frequencies is unique. Among the seven-shading light, red light has the longest frequency, so it is simple for them to “pass” these residue particles without being dispersed. The short-frequency blue and violet light are handily dissipated.

At the point when the sun sets, we see the blazing red sun, which is a similar explanation. At the point when the sun sets, the optical fiber goes through the thick environment diagonally, losing the vast majority of the blue and green light, so just orange light remaining parts. Light that has a more drawn out frequency than red light is called bright light.

This sort of light is simpler to go through the environment, however it is undetectable to the unaided eye, yet it could be seen through an instrument. At the end of the day, when daylight goes through the environment, red light or light with longer frequencies is simpler to go through, so the LED warning lights  are primarily red light.

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