Learn about both the different light bulb bases and light bulb base sizes. The A Group: A15, A19, A21, and A25 The true bulb is a layered structure filled with plant carbohydrates with a plant shoot in the core. Since light bulbs have different base types, if you know the base of the bulb you are looking for, we can omit the bulbs that do not have that base type. Light Bulb Base Types. First you have to determine if it’s a screw, bayonet, wedge, or bi-pin base. They contain mercury and can take a while to warm up to full brightness. While the bulb life varies, they will generally last for about one thousand hours. These light bulbs are commonly available with both bayonet (B22) and screw (E27, E14) base types and have a wide variety of applications. Whether it’s a halogen lamp or LED bulb, chances are it’ll have one of the following bases or caps. For Alaska/Hawaii, the base rate is $27.59 and surcharges may apply for larger orders. They can last up to 20,000 hours. 1 (888) 455-2800 Fax 1.508.363.2900. www.bulbs.com The intermediate E17 base is not very common. Some linear fluorescents have asingle pin Fa8 or recessed double contact R17d, but they are not very common. Now that you've got the bulb spacing, pin type, wattage, and voltage, it's time to find a replacement bulb. Snap a picture of an item you like and we'll show you similar products. Incandescent light bulbs are widely available and universally accepted inside many homes. FREE Shipping on orders over $25 shipped by Amazon. Screw-in light bulbs have different base sizes. Also known as Edison light bulbs, they are distinguished by the antique-style filament in the center. Decorative bulbs add drama to decorative lighting while function is most important in appliance bulbs. Different types of light bulbs work and look best in different types of light fixures. These have a shorter lifespan than other light bulb varieties and usually burn out after 9 to 12 months of regular use. They also use less electricity to produce the same amount of light as incandescent varieties. Pin Type bases are normally used for track lighting & landscape bulbs. They are commonly used for general lighting in standard light fixtures, such as ceiling lights, lamps, can lights, outdoor spotlight and flood light fixtures, and vanity lights. There are two main types of light bulb bases: screw bases and pin bases. Pin Type bases are normally used for track lighting & landscape bulbs. They mimic the warm glow of incandescent lighting. Bulbs with these bases can be used interchangeably as there is only a 1-millimeter difference in base size. Made without hazardous ingredients, they are environmentally friendly and have an exceptional lifespan. Unlike CFL bulbs, they don’t need time to warm up. Bulbs with these bases are commonly used for appliance lights, such as microwave lights, refrigerator lights, and range hood lights. These types of light bulbs fit a variety of fixtures. This is the standard type of light bulb most people use in their homes. It is important to determine if the type you intend to purchase matches the type taken by your light fixture. Vintage light bulbs add a decorative touch to the conventional light fixtures in your home. Bulbs are identified with a letter to indicate the shape or type, and with a number to indicate the approximate diameter in eighths of an inch. The following are a list of the most common types of chandelier light bulb bases. Incandescent bulbs are susceptible to temperature changes. Types of Light Bulb Bases. E12 Candelabra. Light bulbs for automobiles are made in several standardized series. Tip: Many appliance light bulbs are also of the incandescent variety, including oven, microwave and refrigerator light bulbs. They are larger screw bases (E39) than a typical medium screw base bulb (E26). PAR (parabolic aluminized reflector) spotlight and flood light bulbs: PAR16, PAR20, PAR30, PAR38, BR (bulged reflector) spotlight and floodlight bulbs: BR20, BR30, BR40. Click Here to Save and Print What is the Difference between Light Bulb Bases? These bulbs were designed to emit bright beams of light for all driving and road conditions. They are available in packs of two. The number meanwhile refers to the size of the bulb. Bulbs with E12 bases are commonly used for decorative applications, such as chandeliers, wall sconces, Christmas lights, restaurant pendant lights, ornamental lights, residential or commercial string lights, and night lights. Click on any of the illustrations to view a list of bulbs with that light bulb base. Dramatic globe bulbs are great for custom lighting pieces in the den or dining room. In North America and Europe, these light bulb base types are the most common and widely used. PAR (parabolic aluminized reflector) bulbs: PAR20, PAR38, PAR40. Light bulb base size is crucially important to ensure a given lightbulb will fit into its designated socket. The numbers refer to base width in millimeters. Other decorative light bulbs include  candelabra bulbs that complement chandeliers, sconces and ceiling fans. Bulbs By Base Type is a catalog of light bulbs whereby a bulb can be found by the type of base that the light bulb has. For example, a bulb with an E12 base is an Edison screw in base with a 12 millimeter diameter. This most common general purpose bulb type would be classed as "A19/E26" or the metric version "A60/E27". Common Light Bulb Base Types Look at your fixture to determine its base type. Screw Bases. They emit a softer glow and use minimal amounts of electricity. A-series bulbs are also known as Arbitrary, General Lamp Service (GLS), or Standard bulbs. Coronavirus (COVID-19) Update: Bulbs.com is committed to health and safety. 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