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A common use of a strobe flash is to optimize a car engine's efficiency at a certain rotational period by directing the strobe-light towards a mark on the flywheel on the engine's main axle. The strobe-light tool for such ignition timing is called a timing light. Strobe lighting has also been used to see the movements of the vocal cords in slow ...
The emergency stop signal is automatically activated if the vehicle speed is greater than 50 km/h (31 mph) and the emergency braking logic defined by regulation No. 13 (heavy vehicles), 13H (light vehicles), or 78 (motorcycles) is activated; the ESS may be displayed when a light vehicle's deceleration is greater than 6 m/s 2 (20 ft/s 2) or a ...
For battery-operated devices, this voltage must be generated by a boost converter circuit within the device. This converter often makes a faintly audible whine or siren sound while the backlight is activated. Line-voltage-operated devices may be activated directly from the power line; some electroluminescent nightlights operate in this fashion.
Most modern electric lighting is powered by centrally generated electric power, but lighting may also be powered by mobile or standby electric generators or battery systems. Battery-powered light is often reserved for when and where stationary lights fail, often in the form of flashlights or electric lanterns, as well as in vehicles.
The discovery of electricity soon led to experiments with using it to power locomotive lights, with the first-known example, a battery operated light, being tested in Russia in 1874. In 1883, a railroad company in France also experimented with electrical lights, but the first example to go into production was designed by an American inventor in ...
One-color light is well suited for traffic lights and signals, exit signs, emergency vehicle lighting, ships' navigation lights, and LED-based Christmas lights Because of their long life, fast switching times, and visibility in broad daylight due to their high output and focus, LEDs have been used in automotive brake lights and turn signals.
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