Lights used for emergency vehicle lighting are variously light bars, mini light bars, directional arrow bars, beacons, dash lights, decks lights, and visor lights. Besides these, various types of small lights with detachable or permanent mounts are available for emergency vehicle lighting in undercover operations. These are designed to be mounted on the grille, windshield, bumper, or license place or anywhere on the car based on the necessity and convenience of the situation.
All the different types of lights used in emergency vehicle lighting rely on three basic light emitting mechanisms for their brilliant, blinking lights. These are LED technology, strobe technology, and halogen lamp technology. Of these, LED lights are becoming increasingly popular for emergency vehicle lighting. LED is the acronym for Light Emitting Diodes, where a light is produced when an electric current is passed through a diode. This form of light emission is different from the light emission resulting either from heating, a chemical action, or a mechanical action. The phenomenon is known as electro luminescence.
The light produced by the LED mechanism is directional and this is one of the reasons that make LED lights popular in emergency vehicle lighting. A diode is a device, which has two electrodes. It lets an electric current pass through it in one direction and blocks the passage of the current in the reverse direction. Because of this property, the light produced by a diode as a response to an electric field is unidirectional. Other things that make LED lights a popular choice for use in emergency vehicle lighting are its durability, low rate of energy consumption, fast activation, and small size. But LED lights are a bit on the costly side and also require accurate thermal management. Because of it, strobe lights, which was the common choice for emergency vehicle lighting before LED lights came on the scene, is still used widely.
Strobe light is produced through what is called a flash lamp. A flash lamp is a sealed glass tube filled with the gas xenon, and with electrodes at both ends to convey the electrical charge to the gas. Light is emitted when the gas is triggered into action by the passing of the electrical current. Strobe lights do a fine job in emergency vehicle lighting because the desired color spectrum, and different intensities of light, can be produced by variously controlling the current density, pressure of the gas, or shape of the tube.
Halogen lights had ruled without much competition in the emergency vehicle lighting arena before strobe lights joined the game. These are incandescent lamps where light is produced as a result of heat. Halogen lamps are typically a sealed glass case filled with an inert gas and a tungsten filament. Increasing and decreasing the voltage control light intensity. Though less durable than the other two, halogen lights are not expensive, and so is the preferred choice of many for emergency vehicle lighting. Many of the lights used for emergency vehicle lighting will be available as LED, strobe, and halogen. For example, in beacons, there will be LED beacons, strobe beacons, and halogen beacons.
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Post time: 11-26-2016