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Headlights for automobiles may be of the sealed beam type, meaning that the reflector, the lens array on the front and the bulb are all one unit that must be replaced together in case of burnout. They are clamped into a structure for aiming the beams to meet safety requirements. Every time the headlight is replaced, the aiming of the beams must be checked. Headlights using sealed beams were introduced in the United States in 1940 and became mandatory from the following year until the 1984 model year; cars prior and subsequent to that date could have a variety of shapes of headlamps. The limited range of standard sealed-beam lamps restricted styling options for automobiles, and current headlamp designs allow mandated light levels to be obtained with more compact lamps. Sealed beams come in various voltages, most commonly 6, 12, 28, 120 and 230 V. Aircraft landing lights, which are also used in open air concerts and for stage lighting, are sealed beams that have a very narrow beam spread. Modern sealed beams have an additional envelope around the filament, whereas older types do not. The inner envelope contains a halogen to improve the life of the filament and enable more light for the same power; for this to work, the halogen must be confined to the area around the filament by the second envelope, commonly made of fused quartz to withstand the filament's heat. These "halogen sealed beams" appeared on U.S. cars in 1978 to enable halogen technology under Federal Motor Vehicle Safety Standard 108, which at the time required sealed beam headlamps; they continued even after FMVSS 108 was amended to permit composite headlamps in 1983, and came to dominate the sealed beam lamp market. Building and stage lighting In stage lighting, sealed beam lamps are often used. A common size, also used in rock concerts, as well as outdoor architectural lighting, is the parabolic aluminumized reflector 64 (PAR64). PAR lamps are measured in non-SI units of measurement equal to one eighth of an inch, so a PAR64 light is a light that is 8 inches in diameter. The fixtures that such sealed beam lights go into are called "PAR cans", so a PAR64 fixture is an 8 inch diameter can. Other popular sizes are PAR56, PAR38, and PAR36. Beam spreads are designated as FL (flood), SP (spot), NSP (narrow spot), and VNSP (very narrow spot), as stamped on the back of the lamp's reflector. A PAR64 sealed beam typically comes in 250 W, 500 W, or 1000 watt. World Forum for Harmonization of Vehicle Regulations Horst Bauer Bosch Automotive Handbook 4th Edition Robert Bosch GmbH, Stuttgart 1996 ISBN 0-8376-0333-1 page 710 Part of the Automobile series Automobile platform Body-on-frame Bumper Cabrio coach Chassis Continental tire Crumple zone Dagmar bumpers Decklid Fender Fender skirts Grille Hood Hood scoop Monocoque Overhang Pillar Pontoon fenders Quarter panel Shaker scoop Spoiler Subframe Tonneau Butterfly doors Canopy door Gull-wing door Scissor doors Sliding doors Suicide door Greenhouse Power window Quarter glass Sunroof Windshield/Windscreen Windshield/Windscreen wiper Bumper sticker Curb feeler Hood ornament Japan Black paint Monsoonshield Nerf bar Tire/Tyre Tow hitch Truck accessory Daytime running lamp Headlamp Hidden headlamps High-intensity discharge lamps Retroreflector Sealed beam Trafficators Motor vehicle theft Parking sensors Vanity plate Vehicle Identification Number Vehicle registration plate Vehicle horn Windshield/Windscreen washer fluid Wing mirror Backup camera Boost gauge Buzzer Carputer Electronic instrument cluster Fuel gauge Global Positioning System and Automotive navigation system Head-up display Idiot light Malfunction Indicator Lamp Night vision Odometer Radar detector LIDAR detector Speedometer Tachometer Trip computer Bowden cable Cruise control Electronic throttle control Gear stick Hand brake Manettino dial Steering wheel Throttle Automatic vehicle location Car alarm Immobiliser Power door locks VIN etching Airbag Armrest Automatic seat belts Bench seat Bucket seat Child safety lock Rumble seat Seat belt Air conditioning Automobile accessory power Car audio Car phone Center console Dashboard Flat tire Glove compartment RF connector Power steering Rear-view mirror Sun visor Categories: Incandescent light bulbs The e-commerce company in China offers quality products such as Turbine housing Manufacturer , Turbo Shaft and Wheels Manufacturer, and more. For more , please visit Repair kits today!
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