Editing Headlamp (section)

==== Bulb types ====
[[File:2014 Toyota Avalon Quadrabeam Headlamp.jpg|thumb|2014 [[Toyota Avalon]] headlamp with "Quadrabeam"-styled HID low beams, halogen high beams, and [[Light-emitting diode|LED]] [[daytime running light]]s that also illuminate at a lower intensity to provide the [[Automotive lighting#Front position lights|front position light]] function]]

HID headlamps produce between 2,800 and 3,500 lumens from between 35 and 38 watts of electrical power, while halogen filament headlamp bulbs produce between 700 and 2,100 lumens from between 40 and 72 watts at 12.8&nbsp;V.<ref name=R37>{{cite web|url= http://www.unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/R037r7e.pdf |title=ECE Regulation 37 for motor vehicle filament bulbs }}&nbsp;{{small|(1.78&nbsp;MB)}}</ref><ref>{{cite web|url= https://www.unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/2015/R099r3e.pdf |title=ECE Regulation 99 for motor vehicle HID bulbs }}&nbsp;{{small|(268&nbsp;KB)}}</ref><ref>{{cite web|url=http://fmvss108.tripod.com/light_source_list.htm |title=49CFR564 Replaceable Bulb Headlamp Light Source List |website=Fmvss108.tripod.com |access-date=2010-12-29}}</ref>

Current-production bulb categories are D1S, D1R, D2S, D2R, D3S, D3R, D4S, and D4R. The ''D'' stands for ''discharge'', and the number is the type designator. The final letter describes the outer shield. The arc within an HID headlamp bulb generates considerable short-wave [[ultraviolet]] (UV) light, but none of it escapes the bulb, for a UV-absorbing hard glass shield is incorporated around the bulb's arc tube. This is important to prevent degradation of UV-sensitive components and materials in headlamps, such as [[polycarbonate]] lenses and reflector hardcoats. "S" lamps – D1S, D2S, D3S, and D4S – have a plain glass shield and are primarily used in projector-type optics. "R" lamps – D1R, D2R, D3R, and D4R – are designed for use in reflector-type headlamp optics. They have an opaque mask covering specific portions of the shield, which facilitates the optical creation of the light-dark boundary (cutoff) near the top of a low-beam light distribution. Automotive HID lamps emit considerable near-UV light, despite the shield.

[[File:2014 Toyota Corolla LED Headlight.jpg|thumb|2014 [[Toyota Corolla]] The low beam features LED lighting, halogen high beams, and [[Light-emitting diode|LED]] [[daytime running light]]s that also illuminate at a lower intensity to provide the [[Automotive lighting#Front position lights|front position light]] function]]