How Many Types of Car Headlights Are There?
2 Answers
Car headlights include high beams, low beams, fog lights, and turn signals. There are many types of car bulbs, mainly categorized into H and D types, which can be distinguished by the number of pins and tabs. Common models include H1, H3, H4, H7, H11, etc., with different bulb types used for different positions. Below is an introduction to car headlight models: 1. H1 has a single pin and is mostly used for high beams; H7 has two pins with one tab on the edge and is commonly used for low beams; H3 and H11 are often used for fog lights, though some fog lights may also use H1 or H7. Additionally, different car models use different bulb types. H4 is a dual-function bulb (high and low beam) with three pins and three tabs on the edge, typically used in Japanese and Korean cars; H1 and H7 are commonly used for high and low beams in European cars. 2. Turn signal bulbs, such as PY21W, are also commonly used in headlights. Position lights mostly use W5W, H9, H10, H11, H12, etc. Rear lights often use bulbs like P21W or P21/5W. D represents xenon bulbs, with common models including D1S, D2S, D3S, D1R, D2R, etc. Odd numbers indicate bulbs with starters, while even numbers do not; 2 indicates the presence of mercury, while 3 and 4 are mercury-free. S denotes bulbs for lens systems, while R is for reflector bowls.
There are quite a variety of car headlight models, and the mainstream ones I know of include halogen headlights, xenon headlights, LED headlights, and laser headlights. Halogen lights are the most classic, using heated filaments and gas to emit light, with the advantages of being cheap and easy to install, but they have average brightness and high power consumption. Xenon lights excite xenon gas with high-voltage electricity, producing bright and focused white light, but they require additional ballasts, which increases costs, and there's a slight delay when starting. LED headlights are currently the most popular, relying on light-emitting diodes for high efficiency, fast response, ultra-long lifespan, and energy-saving environmental benefits, though heat dissipation needs to be managed well. Laser headlights are high-tech gadgets, using laser beams to illuminate phosphors for long-distance lighting with low energy consumption, but they are only found on luxury cars and are prohibitively expensive. From a technological development perspective, each type has its suitable application scenarios, and it’s quite interesting to try out different lighting effects while driving.
