11/17/2023 0 Comments Flood light bulbsIn North America and continental Europe, Edison screws took the place of other types of bases for general lighting. In most cases, when bulbs are powered by alternating current, the thread is linked to neutral, and the contact on the bottom tip of the base is connected to the “live” phase. The bulbs have metal bases (caps) that are threaded in the right direction and screwed into matching threaded sockets (lamp holders). Thomas Edison invented it and patented it in 1881. The Edison screw (ES) is a type of light bulb base that is universally used with electric light bulbs. The most common is the Edison screw base, which may be found on most incandescent bulbs and many halogens, compact fluorescents, HIDs, and now LED lights. There are dozens of different light bulb bases. This is why light bulb bases aren’t standardized: if they were interchangeable across light fixtures, people would risk inserting a light bulb into sockets that weren’t designed for them. A light bulb with no grip can be inserted into any kind of light fixture, but it won’t stay in place because the grip and tab don’t match up. Light fixture sockets have a grip on the inside of the socket, and light bulb bases have a matching metal tab on the outside of the base. This is to prevent dangerous light bulbs from being used in light fixtures that aren’t designed for them. However, light bulb bases are not standardized. If light bulb bases were standardized, light bulbs could be interchangeable across many fixtures. The light bulb base has to match the socket in the light fixture. Light bulbs have to fit snugly into light fixtures, so they are designed with different bases. Light Bulb Base Sizes Why do lights have different bases? Here is a light bulb base chart that includes pictures of conventional light bulb bases, such as fluorescent bases, LED light bases, automotive light bulb bases, halogen bases, etc., to help you find the light bulb base you have in your hand or need for your light bulb socket. The three most often used bases in the United States of America for traditional lighting are the E12 (candelabra), the E26 (medium), and the E39 (mogul). Additionally, this base is referred to as a Medium socket. The size is a simple millimeter measurement of the width.Īn E26 base (the most common type) is 26 millimeters wide and features an Edison thread interior. The E stands for Edison and indicates that the base is a screw type. The most common type of base is the E type. The base of a light bulb also contains information about the bulb type, and wattage, which may also indicate the maximum overall length of the bulb.īase sizes are determined by a simpler rule known as Type-Size. Light bulb base sizes vary with the type of bulb and application. Additionally, it provides a light bulb base sizes chart in shareable image format. It broadly covers what the different light or lamp bases mean, why different lamp bases are used for different lighting applications, and where those light bulb bases are used. This article discusses the different types of light bulb bases. To fit the bulb socket, light bulb bases are made to fulfill these same specifications. Luckily, there are standards for light bulb base sizes in the lighting industry, and parts are made to meet those standards.
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