Led Bar Lights, Revolving Bar Light 12v, 24v, Ambulance Bar Lights

Emergency vehicle lighting refers to any of several visual warning devices, which may be known as light bars or beacons, fitted to a vehicle and used when the driver wishes to convey to other road users the urgency of their journey, to provide.......

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Emergency vehicle lighting refers to any of several visual warning devices, which may be known as light bars or beacons, fitted to a vehicle and used when the driver wishes to convey to other road users the urgency of their journey, to provide additional warning of a hazard when stationary, or in the case of law enforcement as a means of signalling the driver to stop for interaction with an officer. These are additional to any standard lighting on the car such as hazard lights and are often used along with a siren (or occasionally sirens) in order to maximize their effectiveness. In many jurisdictions, the use of these lights may afford the user specific legal powers, and may place requirements on other road users to behave differently, such as compelling them to pull to the side of the road and yield right of way so the emergency vehicle may proceed through unimpeded.
Emergency vehicle lighting is generally used to clear the right of way or to warn oncoming motorists of potential hazards, such as a vehicle that is stopped or moving slower than the rate of traffic. It may also be used to provide specific directions to motorists, such as a command to pull over. Some vehicles incorporate a small arrow board or even a text matrix display to direct traffic.

The use of emergency beacons is restricted by law in many jurisdictions only for responding to an emergency, initiating a traffic stop, bona fide training exercises, or when a specific hazard exists in the road.
Optical types

The optical and mechanical characteristics of the lights used can have a significant effect on the look of the vehicle and how readily it gains attention in emergencies.
Steady burning

The simplest form of lighting is a steadily burning lamp. These may be white lights used on scene to enable emergency workers to see what they are doing, or they may be colored lights that advertise the emergency vehicle's presence. In the latter case, steadily burning lights are often used alongside rotating or flashing lights rather than on their own, though historically some emergency vehicles only displayed steadily burning lights.
Rotating light
The parts and workings of a rotating light: Top The assembled beacon, including an optional mirror to be used when the beacon is placed in the windshield or rear window. Center The beacon, with the mirror removed. Bottom left and right The green dome of the beacon has been removed to show its rotating reflector, incandescent lamp, and electric motor.

These revolving lights may contain a single bulb around which a curved mirror is spun, creating a rotating beam of light, which appears to flash when viewed from a stationary position. Larger rotating lights may contain 2 or 4 modular or sealed-beam lamps which rotate as an assembly.

To protect the workings of the beacon, a plastic dome often covers the assembly. These domes usually come in solid colors, but in some cases the front and back halves of the dome are different colors. Other beacons use a clear dome with colored lenses on each lamp. Especially in the last case, these rotating beacons are sometimes referred to colloquially as "gumball machines" or sometimes "cherry tops" in the case of red lights.

Rotating lights often use a quartz-halogen or conventional incandescent bulb, though some rotating beacons are now made with LEDs rather than bulbs.

Rotating lights may be used in lightbars as well as in single beacons. In a modern enclosed lightbar, generally 'V'- or diamond-shaped mirrors are provided between the lamps to give the effect of multiple flashing lights.
Strobe lights

Some emergency lighting is based on strobe lights similar to those used in flash photography. These xenon flash lamps put out a very brief but very bright flash by ionizing and then discharging a large current through the gas. The light produced has a somewhat bluish emission spectrum, which makes red lightbars glow a fuchsia-pink color when lit.

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Revolving Light, Bar Light, Led Bar Light, Revolving Bar light