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Only emergency and police vehicle may use blue lights. This includes firefighters, rescue services, emergency response vehicles for public utilities and civil defense units. All other kinds of blue lights (e.g. car floor lighting or cab interior lights), including reflective stickers or paintings, are illegal on public roads. [38]
The reverse function was only achievable with the introduction of blue LEDs; by mixing red, green and blue LEDs in a defined distributed pattern behind a lens, white light was produced that conformed to the legal requirements of a reverse light. In North America, the 2000 Cadillac Deville was the first passenger car with LED taillights. [144]
This method involves coating LEDs of one color (mostly blue LEDs made of InGaN) with phosphors of different colors to form white light; the resultant LEDs are called phosphor-based or phosphor-converted white LEDs (pcLEDs). [32] A fraction of the blue light undergoes the Stokes shift, which transforms it from shorter wavelengths to longer.
These lights are usually mounted on the roof and incorporated into the standard vehicle system of external lights. Most police vehicles are also fitted with a siren. In addition to blue lights, many traffic and incident response cars are fitted with flashing red lights that are only visible at the rear of the vehicle.
Police cars, fire trucks, ambulances or other emergency vehicles have sirens and red and blue or red and white or red lights. Private vehicles operated by volunteer fire and rescue squad members (with emergency vehicle identification) responding to an emergency call use blue lights. [4]
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3579 S High St, Columbus, OH · Directions · (614) 409-0683