2023-09-04 10:38:17  Click:446
A detailed explanation of how warning lights work, with pictures and text revealing the technology behind flashing signals.


Warning lights are common signal lights used to convey emergency information and remind people to pay attention to safety on roads, factory workshops, machinery and equipment, etc.

Warning lights often come in different colors, shapes, flash patterns and frequencies to differentiate between different situations and needs.

warning lightbarsurface mount light

How are the working principles and technology of warning lights implemented? This article will introduce the working principle and technology of warning lights from two aspects: optical principles and circuit control.

Optical principles

The optical principle of the warning light is based on the scattering and reflection characteristics of light. It uses a light source to generate a strong beam, and the built-in reflector gathers the light and irradiates it into the external environment, making it produce obvious visual effects.

grille light

At the same time, the warning light also adopts a periodic flashing method, which is more likely to arouse people's vigilance and attention.


The reflector of the warning light can have a variety of shapes and structures, such as round, square, tower, etc. Different reflectors have different focusing effects and ranges. For example, tower reflectors can disperse light in multiple directions

Circuit control

The circuit control of warning lights mainly includes three aspects: signal control, time control and brightness control.

It can be implemented in a variety of ways, such as bridge rectifier circuit, thyristor circuit, microcontroller circuit, etc.

Different circuit approaches have different stability and complexity. For example, the thyristor circuit can realize the flicker control of the light bulb, and the single-chip microcomputer circuit can realize the flicker control of the LED

Signal control

Signal control is a special vehicle that refers to the selection of appropriate colors, shapes, flashing patterns and frequency of sign lamps, as well as corresponding tone and sound pressure level sirens according to different occasions and needs when performing emergency tasks, in order to distinguish different Special vehicles and deliver different emergency messages.

Signal control of special vehicles

Police cars usually use red and blue rotary police lights and two-tone switching or emergency FM sirens. For example, when chasing criminal suspects or escorting important people, police cars can use emergency FM sirens and red rotary sirens. Police lights to indicate an extreme emergency.

police car

Ambulances typically use blue swivel marker lights and a slow two-tone siren, for example, when transporting a critically injured patient or a patient in cardiac arrest, an ambulance may use a slow two-tone siren and a blue Swivel sign luminaires to indicate life-threatening situations.


Fire trucks usually use red rotary warning lights and continuous frequency-tuned sirens. For example, when fighting a fire or rescuing trapped people, fire engines can use continuous frequency-tuned sirens and red rotary warning lights to indicate the fierceness of the fire. or dangerous and serious situations.

fire truck

Engineering emergency vehicles usually use yellow rotary sign lamps and single-tone off-tone sirens. For example, when repairing power or water lines or clearing landslides, engineering emergency vehicles can use single-tone off-tone sirens and yellow rotary sign lamps to indicate important work or high-risk situations.

Brightness control

Brightness control refers to adjusting the luminous intensity and range of the warning light according to different distances and angles to ensure its visibility and effectiveness.

For example, when viewed from a distance or from the side, the brightness and coverage area of the warning light need to be increased; when viewed from near or from the front, the brightness and coverage area of the warning light can be reduced.


In this article, I introduce the working principle and technology of warning lights, as well as special vehicle signal control methods under different occasions and needs.

I think warning lights are a very important safety equipment that can provide effective visual and sound prompts in emergencies and protect people's lives and property.

I hope that through this article, readers can have a deeper understanding and understanding of warning lights, and also improve their respect and cooperation for special vehicles.


At the same time, I also think that there is still some room for improvement and development in warning lights, such as:

The color, shape, flashing pattern and frequency of warning lights and other signals can be appropriately adjusted and unified according to the legal regulations and habits of different countries and regions to reduce misunderstandings and conflicts.

The light source, reflector, circuit and other components of the warning light can use more advanced and energy-saving materials and technologies to improve the performance and life of the warning light and reduce the cost and maintenance of the warning light.

Warning lights can be combined with other smart devices and systems, such as GPS, radar, cameras, etc., to achieve more precise and intelligent signal control and information transmission.

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