To compensate, cooling measures or heat sinks must be implemented to prevent damage. Compared with halogen, little heat is dissipated, presenting a problem with temperature build-up on the LED chips, especially in high-power applications. Interestingly, the light produced is directional, thereby eliminating the need for a reflective element, which results in a smaller headlamp. It involves semiconductors with electrons moving from a high-energy state to a lower level and releasing energy in the form of photons (light). The light-emitting diode (LED) produces light by electroluminescence, which is based on quantum theory. Pro: More efficient and powerful than halogen bulbsĬons: Takes a few seconds to reach full brightness more complex and costly than halogen LED White with a blue tint (4 500 K colour temperature) Bi-xenon refers to a single xenon headlamp with a moveable, internal shield to produce both high and dip beams from a single light source. The lamp needs to reach optimal operating temperature before constant light is produced. Interestingly, only a small percentage of xenon gas is used in the (mostly metal-halide) lamp to speed up the start-up process. Instead, a high-voltage arc between two electrodes is used to excite the gas mixture in the glass tube. There is no glowing filament (as in halogen lights). It employs a similar type of technology as found in household tube lighting. Pros: Cheap (R200 per bulb) simple technology easy to replaceĬons: Energy wastage, as it runs very hot (the gas inside the glass envelope heats up to 200 ☌, with the tungsten filament at more than 2 000 ☌) HID (xenon and bi-xenon)Ī high-intensity-discharge (HID) headlamp is also known as a xenon unit. It’s cheap, simple tech that is easy to replace. This results in the production of constant light throughout its operating life. The “halogen cycle” redeposits the evaporated tungsten back on the filament, which prolongs its life and keeps the glass envelope clean. Usually, a tungsten filament is employed in the glass housing filled with a mixture of an inert gas (like argon) and a small amount of a halogen (as listed on the periodic table, such as iodine or bromine). HalogenĪ bulb with glass envelope (similar to the household item) operating on the incandescent principle. The figures are for a single headlamp consisting of a high and low beam. These are the four most common forms of automotive lighting used in headlamps.
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