What is the difference between H1 and H7 bulbs?

[MacElena]

The main difference between automotive bulbs H1 and H7 is the number of terminals. H1 has one terminal, while H7 has two. H1 is a single-filament, single-pin bulb, commonly used for high beams. H7 is a single-filament, double-pin bulb, typically used for low beams. Both types of bulbs are available in halogen and xenon variants. There are four main types of automotive headlights: halogen, xenon, LED, and laser. Halogen bulbs: Also known as tungsten halogen or quartz bulbs, halogen bulbs are a variation of incandescent bulbs. They contain a tungsten filament, and when the iodine or bromine inside the bulb reacts with the filament at high temperatures, it produces light. Halogen bulbs operate on either 220V AC or 12V DC. They have a longer lifespan than most incandescent bulbs and are known for their low cost and simple structure. The working principle involves injecting halogen gases like iodine or bromine into the bulb. At high temperatures, the sublimated tungsten reacts with the halogen, and upon cooling, the tungsten re-solidifies on the filament, creating a balanced cycle that prevents premature filament breakage. Xenon bulbs: These bulbs are filled with inert gases like xenon and produce light through electric discharge. Xenon bulbs are three times brighter than traditional halogen bulbs and last up to 10 times longer. Their color temperature ranges from 3000K to 12000K, with 6000K being similar to sunlight, offering more options for those looking to upgrade their car lights. Working principle: Inside an ultraviolet-resistant quartz glass tube, various chemical gases are filled. A booster then increases the car's 12V DC voltage to 23000V instantly, exciting the xenon gas electrons inside the quartz tube to produce light between the two electrodes. LED lights have become popular in recent years. LED headlights are known for their energy efficiency, environmental friendliness, durability, compact size, and instant illumination. Due to structural and cost constraints, they are typically found in high-end vehicles. Laser lights are a more advanced type of headlight, currently only available in premium luxury cars. The light-emitting component is a laser diode, which has a high production cost, making cars equipped with laser lights very expensive.