H7 (lamp)
Light bulbs for automobiles are made in several standardized series. Bulbs used for headlamps, turn signals and brake lamps may be required to comply with international and national regulations governing the types of lamps used. Other automotive lighting applications such as auxiliary lamps or interior lighting may not be regulated, but common types are used by many automotive manufacturers. International The World Forum for Harmonization of Vehicle Regulations (ECE Regulations) develops and maintains international-consensus UN Regulations on light sources acceptable for use in lamps on vehicles and trailers type-approved for use in countries that recognise the UN Regulations. These include Regulation 37, which covers light sources for Headlamp#High-intensity discharge (HID), high-intensity discharge headlamps. Some UN-approved bulb types are also permitted by some other regulations, such as those of the United States or of Japan, though Japan has begun supplanting the former Japa ...
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Headlamp
A headlamp is a lamp attached to the front of a vehicle to illuminate the road ahead. Headlamps are also often called headlights, but in the most precise usage, ''headlamp'' is the term for the device itself and ''headlight'' is the term for the beam of light produced and distributed by the device. Headlamp performance has steadily improved throughout the automobile age, spurred by the great disparity between daytime and nighttime traffic fatalities: the US National Highway Traffic Safety Administration states that nearly half of all traffic-related fatalities occur in the dark, despite only 25% of traffic travelling during darkness. Other vehicles, such as trains and aircraft, are required to have headlamps. Bicycle headlamps are often used on bicycles, and are required in some jurisdictions. They can be powered by a battery or a small generator like a bottle or hub dynamo. History of automotive headlamps Origins The first horseless carriages used carriage lamps ...
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WY21W Lamp
Wy or WY may refer to: Places: * Principality of Wy, an Australian micronation * West Yorkshire, an English county ** West Yorkshire Metro transit system * Wyoming, US (postal abbreviation) Other uses: * WY Records, a record label * Oman Air, the national airline of Oman * WebYeshiva, a website for religious study * Wisin & Yandel, a Puerto Rican reggaeton duo * Weyerhaeuser Weyerhaeuser () is an American timberland company which owns nearly of timberlands in the U.S., and manages an additional of timberlands under long-term licenses in Canada. The company also manufactures wood products. It operates as a real e ...

W21W Lamp
W, or w, is the twenty-third and fourth-to-last letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. It represents a consonant, but in some languages it represents a vowel. Its name in English is ''double-u'',Pronounced in formal situations, but colloquially often , , or , with a silent ''l''. plural ''double-ues''. History The classical Latin alphabet, from which the modern European alphabets derived, did not have the "W' character. The "W" sounds were represented by the Latin letter " V" (at the time, not yet distinct from " U"). The sounds (spelled ) and (spelled ) of Classical Latin developed into a bilabial fricative between vowels in Early Medieval Latin. Therefore, no longer adequately represented the labial-velar approximant sound of Germanic phonology. The Germanic phoneme was therefore written as or ( and becoming distinct only by the Early Modern period) by ...
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