What is the difference between HB3 and 9005?
2 Answers
HB3 and 9005 are the same model specification, with no difference between them. Sometimes they are labeled together as HB3 and 9005, which is a labeling method for U.S. standard car lights. Car headlights include high beams, low beams, fog lights, and turn signals. There are many types of car bulbs, mainly divided into H and D categories, which can be distinguished by the number of lamp pins or tabs. Common models include H1, H3, H4, H7, H11, etc., with different bulb models used for different positions. A headlight with 1 lamp pin and a flat rectangular metal base is H1; a headlight with 3 lamp pins, a round metal base, and 3 protruding tabs on the outer edge is H4; a headlight with 2 lamp pins, a round metal base, and 1 protruding tab on the outer edge is H7; a headlight with 2 lamp pins, an oval socket with 1 longer protruding tab on the lower edge is H11; a headlight with 2 lamp pins, an oval socket with 1 smaller protruding tab on the upper edge is HB3 (also called 9005); a headlight with 2 lamp pins, an oval socket with 2 smaller protruding tabs on the upper edge is HB4 (also called 9006). Other commonly used bulbs in headlights include turn signal bulbs such as PY21W; position lights mostly use W5W, H9, H10, H11, H12, etc.; rear lights commonly use P21W, P21/5W, and other bulb models. D represents xenon lights, with common xenon light models including D1S, D2S, D3S, D1R, D2R, etc. Odd numbers indicate bulbs with starters, while even numbers indicate bulbs without starters; 2 indicates the presence of mercury, while 3 and 4 indicate mercury-free; S indicates use with a lens, while R indicates use with a reflector. Methods to distinguish car bulb models: By observation, if the headlight is a combination of high and low beams, it indicates the bulb model is H4; you can also check the manual that came with the car when purchased, which specifies the bulb model; alternatively, you can open the hood, remove the headlight protective cover, take out the bulb, and check the lamp pins or base to identify the bulb model.
HB3 and 9005 are essentially two names for the same type of bulb. HB3 is the international standard, commonly used in regions like Europe, while 9005 is the North American designation. However, their basic specifications are identical: both have a power rating of around 65 watts, similar light output intensity, and are used for high beams or driving lights in vehicles. The base design is also the same, featuring a P20d socket. So, when purchasing replacement bulbs labeled as HB3 or 9005, they are fully interchangeable without compatibility concerns. I often encounter this question when helping friends with car repairs—many assume there are performance differences, but actual testing shows no variation in brightness or lifespan. At most, there might be quality differences between brands like Philips or Sylvania, but these have minimal impact on lighting performance. In short, don’t be fooled by the naming—they’re like twin brothers, equally suitable for upgrading headlights in SUVs or sedans, with similar pricing. Just opt for a reliable brand.
