Headlight | Wikipedia audio article
Channel: wikipedia tts
Date: 04/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Headlamp


00:01:12 1 History of automotive headlamps
00:01:23 1.1 Origins
00:01:46 1.2 Mechanics
00:08:54 1.3 Design and style
00:09:24 1.3.1 Headlamp styling outside the United States, pre-1983
00:10:35 1.3.2 Headlamp styling in the United States, 1940&#8211;1983
00:15:56 1.3.3 International headlamp styling, 1983&#8211;present
00:17:28 1.3.4 Hidden headlamps
00:20:08 2 Regulations and requirements
00:21:25 2.1 Low beam
00:22:30 2.2 High beam
00:23:13 2.3 Compatibility with traffic directionality
00:25:48 2.4 Adequacy
00:26:16 2.5 Use in daytime
00:27:35 2.6 Construction, performance, and aim
00:31:58 2.6.1 Light colour
00:32:05 2.6.1.1 White
00:32:50 2.6.1.2 Selective yellow
00:39:00 3 Optical systems
00:39:11 3.1 Reflector lamps
00:39:20 3.1.1 Lens optics
00:39:57 3.1.2 Reflector optics
00:42:35 3.1.2.1 Dual-beam reflector headlamps
00:43:33 3.1.2.1.1 American system
00:45:42 3.1.2.1.2 European system
00:49:13 3.1.2.1.3 Developments in the 1990s and 2000s
00:50:12 3.2 Projector (polyellipsoidal) lamps
00:53:22 4 Light sources
00:53:32 4.1 Tungsten
00:54:40 4.2 Tungsten-halogen
01:01:35 4.2.1 Halogen infrared reflective (HIR)
01:02:21 4.3 High-intensity discharge (HID)
01:04:02 4.3.1 Retrofitment
01:05:25 4.3.2 History
01:07:13 4.3.3 Operation
01:09:26 4.3.4 Burner types
01:11:32 4.3.5 Color
01:12:34 4.3.6 Advantages
01:12:43 4.3.6.1 Increased safety
01:13:38 4.3.6.2 Efficacy and output
01:14:44 4.3.6.3 Longevity
01:15:04 4.3.7 Disadvantages
01:15:13 4.3.7.1 Glare
01:16:17 4.3.7.2 Mercury content
01:17:09 4.3.7.3 Cost
01:17:41 4.4 LED
01:17:50 4.4.1 Timeline
01:21:20 4.4.2 Cold lenses
01:21:59 4.5 Laser
01:22:58 5 Automatic headlamps
01:24:27 6 Beam aim control
01:24:37 6.1 Headlamp leveling systems
01:27:42 6.2 Directional headlamps
01:30:35 6.3 Advanced front-lighting system (AFS)
01:32:32 6.4 Automatic beam switching
01:35:11 6.4.1 Rabinow dimmer
01:36:13 6.4.2 Bone-Midland lamps
01:36:49 6.4.3 Camera-based dimmer
01:37:35 6.5 Intelligent Light System
01:38:22 6.6 Adaptive highbeam
01:40:28 6.7 Glare-free high beam and pixel light
01:42:46 7 Care
01:45:11 8 Lens cleaners



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SUMMARY
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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 mechanically integrated into the workings of the bicycles.