This base was developed by Thomas Edison for the first light bulbs and is still in use today. Pay close attention to lumens, since this number indicates the brightness, or light output, of the bulb. It is used in most incandescent, nostalgic, LED, CFL and halogen light bulbs. Pin bases are mainly used in linear fluorescents, plug-in compact fluorescent bulbs, MR16s, and a few types of HID light bulbs. Each base type has a descriptive term, such as medium, intermediate, candelabra, etc., and they’re defined by the letter E (Edison) followed by numbers. Often they are referred to with a letter-number designation that starts with an "E" followed by the number of millimeters in diameter of the base. Specialty Christmas Bulbs. Most common light bulb uses, including lamps, recessed flush mount flood lights are going to have one of the first three base types shown above. The second letter designates the number of pins or contacts on the lamp. Most light bulbs used in the home use an Edison Screw Base. In technical terms it is an A19 type bulb. 1 (888) 455-2800 Fax 1.508.363.2900. www.bulbs.com Light bulb bases and sockets are normally defined by a letter-number-letter format, with the last letter optional. Light Bulb Bases. Different LED bulb shapes. 243 Stafford St. Worcester, MA 01603. Candle-flame-shaped bulbs: C7, C9, CA10, B10. Look at your fixture to determine its base type. It’s the traditional A-type bulb. A further explanation of the light bulb base sizes, you can look at the letter-number references (E12, E17, and E26) to help understand a bulbs base style and size. The first letter designates the shape or form of the base, the numbers represent either the width of the base or the distance between the pins. PAR light bulbs use a parabolic mirror that focuses all the light. Bulbs with these base types are available in many different styles. Of course, such a variety of shapes and sizes can be not only overwhelming but even confusing, yet, the principles of how light bulbs are divided are, in fact, very logical and you will get the whole picture once you learn about all the possible types. First you have to determine if it’s a screw, bayonet, wedge, or bi-pin base. These bulbs come in various beam angles and they are widely used in spotlights and flood lights. LEDwatcher © 2015 - 2021. This is the most common light bulb base that you can buy and is used in HID, CFL, CCFL, halogen, and incandescent light bulbs. 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. household), namely:eval(ez_write_tag([[970,250],'ledwatcher_com-box-4','ezslot_1',129,'0','0'])); A-shaped bulbs. In its root meaning, though, this is what it is: an object shaped like a flower bulb which produces light. You can most instantly recognize an E26 bulb by looking at the bottom, or non-light emitting side of the bulb. Because they resemble an ear of corn, they are called corn bulbs. A-shaped bulbs: A19, A15, A21 BR (bulged reflector… Screw-base bulbs, often called Edison bulbs, are named after their inventor—Thomas Edison. The naming conventions include terms like medium base and candelabra base. Thank you again SO much for writing such a great and in-depth article! Bulbs with these bases are the most popular of all screw base bulbs. If you do not see the base type you are looking for, give us a call at 800.784.1998, and we can help you locate the correct bulb. However, the standard bulb sizes are A19 and A60. Wow. Thank you SO much for your detailed explanation WITH PICTURES! The first letter designates the shape or form of the base, and the number represents the width of the base (normally in millimeters). An E26 bulb, therefore, is any bulb or lamp that utilizes the E26 cap or base for mounting and electrical contact. The letter E before a number indicates it’s an Edison bulb. Interested in photovoltaics and solar lighting. Screw bases are the most common light bulb base. For instance, A-19 bulb means that it is s “A” type and the diameter would be 19/8″. For non-imperial measured bulbs, the number after the bulb shape is the number of centimeters at the widest point of the bulb. There are several types of screw bases. Each of the base types work differently as their main function is to connect the light bulb to the electrical voltage and the technology of how it is achieved is different in each case. To save the most energy, choose the bulb with the lowest wattage suitable for its … For bulbs powered by AC current, the thread is generally connected to neutral and the contact on the bottom tip of the base is connected to the "live" phase. When thinking about the image of a typical bulb, most of the people picture that one sort of bulb many of us have been using all our childhood. The numbers refer to base width in millimeters. PAR (parabolic aluminized reflector) bulbs: PAR20, PAR38, PAR40. This post covers screw bases. The first designation is the shape of the bulb, the second is the base. This guide is organized by series, with information about other common names, sizes (including light bulb size charts for each series), typical uses, and popular caps and bases. the principles of how light bulbs are divided are, in fact, very logical. Basic Shapes for Christmas light and outdoor string light bulbs The cap or base of a light bulb joins the bulb to the lamp socket in order to provide an electrical connection. Last updated February 3, 2020. Many bulbs with these bases are designed to mimic the look of a candle flame. You need to know the technical name for bulb bases. What is Full Spectrum Lighting and What are its Advantages. You might also hear them referred to as Edison base light bulbs. That usually is listed somewhere on the bulb as well as on the packaging. 115-volt airway beacon light bulb with a Mogul bi-post base With bi-post bases, the lamp orientation is fixed so that the filament will always be in the focal plane. In an incandescent or halogen screw base light bulb, two contact wires link the filament to the base where the electrical voltage is connected to the bulb. E26 bulbs are primarily used in North America while E27 bulbs are most popular in Europe. Or if we’re talking about the G series two-pin base, it would be the distance between the two pins measured in millimeters. The A means Arbitrary Shape and the 19 means … Light Bulb Shapes Types Sizes – Identification Guides and Charts Read More » E27 Medium A little larger than the common E26 medium base, this bulb base can still be used in most applications. However, only three of all the shapes are widely used for everyday purposes (e.g. Save my name, email, and website in this browser for the next time I comment. Tel. Light Bulbs, also known as lamps in the industry, come in a vast variety of sizes, shapes, and temperatures (colors) to allow for an array of fixtures, which need different bases … The Candelabra E12 base is the second most common bulb base which is used for smaller decorative incandescent/nostalgic bulbs. All of the bulbs in these groups resemble the shape of a candle flame and are often referred to as candle bulbs. It’s easy enough to look at the bulb that you need to replace and shop for a bulb with a similar looking base, but how will you know for sure if the bases are identical? Each bulb base should be paired with a light socket of the corresponding size. From top left to bottom right: B10 LED bulbs in wall sconce, CA10 LED bulbs in chandelier, C9 LED bulbs in Christmas light strings, C7 LED bulb in night light. Tags: cfl bulbshalogen bulbshid lampshigh pressure sodium vapor lampsled bulbsmetal halide lamps. 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. A – Standard household incandescent light bulb shape. Most packaging for fan bulbs do not provide all the specifications needed or provide enough detail to make a purchasing decision. However, bulbs have been evolved significantly and now you have them in numerous categories divided by shapes, sizes and base types. C-shaped bulbs look very similar to holiday lamps. When searching for replacement bulbs, we were having a difficult time finding the right type and especially size that would fit between the bulb base, and the metal soffit above the base. If you're looking for a more unique light display outside of traditional C7 & C9 Christmas lights, consider these specialty LED bulb options. Most CFL and LED replacements for incandescent lights will use the "E" base. The Edison screw fitting is a system of screw mounts used for light bulbs developed by Thomas Edison in 1909. PAR-shaped bulbs. For example, C9/E17 means that the bulb is a C9 shape with an E17 base. For example, there are many different bulbs that are the same shape and even have similar looking bases, but those bases might be different sizes. C7 bulbs have E12 Candelabra bases while C9 bulbs have E17 Intermediate bases. What are PIR Lights and Where They are Used? Simply because the next time you will go to purchase a new light bulb for your fixture, you will know what you are looking for. The mogul E39 base is found in larger sized light bulbs, such as high wattage HID. You might also hear them referred to as Edison base light bulbs. Pin Type bases are normally used for track lighting & landscape bulbs. Altogether you can divide all the bulbs into 6 base types: Light bulb base types. Find the light bulb base type you’re looking for with this visual chart- detailed illustrations of general bases, fluorescent bases and specialty halogen base types. Bulbs with these bases can be used interchangeably as there is only a 1-millimeter difference in base size. “A” type bulb shapes are standard types for household lighting but you will see different variations and types of them. If measuring, at what point am I to measure since these are threads? So we had to just buy multiple bulbs to see which ones would fit. It is found on smaller light bulb shapes such as S11, R12, and T6 light bulbs. Simply take your current incandescent watts and select the corresponding LED bulb equivalent on the lumens brightness scale. When she's not immersing herself in all things LED, she's zumba-ing or playing with her two little troublemakers (chihuahuas)! 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. Just checked on several boxes of light bulbs–General Electric, Sylvania, and 2 others . The principle of pin base bulbs differs significantly from screw base lamps. Most of the light bulbs that you buy in stores or online are going to have this kind of base. E26 bulbs are primarily used in North America while E27 bulbs are most... Common bulbs with E26/E27 bases:. The following infographic explores various components of a light bulb. Blogger, editor, developer who loves green living. The most familiar is the Edison screw base found on most incandescent bulbs and many halogen, compact fluorescent, HID and now LED bulbs. The fan/light manual suggested a B10 bulb shape with an E12 base; max-40W. This normally is in the form of letters followed by a number followed by an optional letter. This prevents their use in a luminaire that may have a higher wattage, distribute intense heat, and even become a fire hazard. Electrical current then can pass through the pins and flow into the light bulb to excite the filament and produce light. The main diameter classifications are: As for the length, the bulbs are divided into S (short) and L (long) categories but not always you will see the length indicator mentioned in the product description. LED Downlights: Crisp Illumination for Commercial and Home Applications, Planning for an LED Landscape Lighting Installation, Green LED Lights: Therapy for Migraines/Chronic Pain, How to Make a DIY Christmas Wreath With LED Strip Lights, How to Create Your Own LED Light Fixture: Aluminum Channels, Four Ways to Brighten up Your Thanksgiving. Have you ever found yourself shopping for light bulbs but with no clue as to what will fit your fixture? This is designated by the "E" in the first letter of the base description. However, just two of these base types can be considered as the main ones, namely, screw bases and pin bases. Let’s learn more about lamp bases, which come in all shapes and sizes. The intermediate E17 base is not very common. The main shape designations of light bulbs are: Light bulb shapes. These powerful bulbs have high light output and are used to replace HID bulbs in industrial fixtures, such as high-bay warehouse lights, parking lot lights, canopy lights, and wall packs. The first letter or letters indicate the shape. Screw bases are the most common light bulb base. The bulb’s base is measured differently but in a much easier fashion. From Wikipedia on the Edison Screw Base: "The Edison screw fitting is a system of screw mounts used for light bulbs, developed by Thomas Edison and licensed starting in 1909 under the Mazda … For LEDs, the PAR designation is used for defining the shape since most of the LEDs lack any have a reflective lower surface. The most common of PAR lamps are PAR20, PAR30, PAR38 and PAR42 type of bulbs; nevertheless, those are just a few of the types available. Shop by screw base with our Universal Bulb Finder E26/E27 Medium – Edison 26-mm or 27-mm Diameter. The most common bulb base in the US is the screw medium E26 base. The first letter designates the shape or form of the base, the numbers represent either the width of the base or the distance between the pins. Whereas the screw base connects the light bulb to the voltage with two contact wires connected to the metal base, pin base light bulbs contain two pins that stick out of the base and connect the bulb to the voltage. Like candelabra bulbs with E12 bases, bulbs with E17 bases are used for decorative applications, such as chandeliers, wall sconces, Christmas lights, restaurant pendant lights, ornamental lights, and sign or marquee lights. Use this handy guide to identify different types of light bulb bases that apply to incandescent, halogen, high-intensity discharge, fluorescent, and LED light bulbs. Your article had the MOST detailed and definitive information in one place for us to understand the many different light bulb shapes, sizes, and bases. Screw bases are made in several sizes, and on the packaging you will see that they are referred to by a descriptive name and size. Bulbs with this shape have a bulged base that attenuates to a rounded tip. What are Light Dimmers and Which Type of Light Bulbs are Dimmable? Is an E26 bulb the standard base size? This is done in the form of letter followed by a number. A-19 and A-21 light bulbs, which are most 60 watt and 75 watt light bulbs respectively, are two common examples of "A" bulbs. Click on any of the illustrations to view a list of bulbs with that light bulb base. Source – http://www.bulbs.com. Required fields are marked *. Notify me of follow-up comments by email. Source – http://greenlivingideas.com. Light bulbs are identified by the diameter, length, shape, and screw type. Screw-in bases, also known as Edison bases and light bulb sockets are used through out the world. B-shaped bulbs are also known as Candelabra bulbs. While the numbers indicate the diameter but the optional letter indicates the length of the bulb. Bulbs with these base types can be used interchangeably as there is only a 1-millimeter difference in base size. The second letter designates the number of pins or contacts on the lamp. Reviewing solar products since 2013. Modern light bulbs can be used in a variety of fixtures, and each fixture has its own particular requirements of size and shape of the bulb that it is compatible with. The letter indicates the shape of the bulb but the number following it is the diameter of the bulb in eighths of an inch. Bulbs with E14 bases are popular in Europe and China for chandeliers, wall sconces, lamps, Christmas lights, restaurant pendant lights, ornamental lights, residential or commercial string lights, sign and marquee lights, and night lights. They’re also found in ceiling fan light fixtures. My wife and I have installed new outdoor ceiling fans which require special candelabra bulbs. In North America and Europe, these light bulb base types are the most common and widely used. Your email address will not be published. Light bulbs come in a variety of shapes and sizes and are generally categorized by their bases (the part that screws into a light socket). None of them have any base designation on box or bulb. Our bulbs can be no longer than 3.25 inches in order to cant them sideways and then insert the bulb base into the receptacle to begin screwing down and into the receptacle. You can determine it by measuring the diameter of the base (the thickest parts). This article will briefly cover each category and provide you some useful information so that you actually know which type of bulb you need for different situations and fixtures. Why is it good to know this? The respective parameters (shape, size and base type) appear on the package of the product. It’s most likely E26 which is the most common base. Filament configurations such as the C13D (coiled, zig-zagged) emit far more light perpendicular to the zig-zag than parallel to it. It is used in most incandescent, halogen, CFL, CCFL, and HID light bulbs. E39 bulbs are primarily used in North America while E40 bulbs are popular in Europe. The mogul pre-focused (MPF) base is similar to the screw base in that it connects the filament to the base with two soldered … ER – Extended reflector light bulb shape; K -Krypton or narrow reflector light bulb shape; PS – Elongated standard incandescent bulb. Indeed, many lamps have their own unique base. Your email address will not be published. LED bulbs with these bases typically have a cylindrical shape like ED and BT HID bulbs. As for the diameter and length, the categorization is a lot more simple. The bulbs of this shape are very wide-spread in chandeliers, night lights, and lower wattage applications. 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. A normal household light bulb is on average a 60 watt light bulb. The common terms are medium, intermediate, candelabra and mogul. Source – wikipedia.org. There are four commonly used thread size groups for lamps: Candelabra: E12 North America, E11 in Europe. The bulbs have right-hand threaded metal bases (caps) which screw into matching threaded sockets (lamp holders). Note, as a rule of thumb, traditionally C9 bulbs “always” have E17 bases so many times, the base is also referred to as C9 as well. Bulbs.com. Most standard screw-base light bulbs—such as the GE 60 watt incandescent light bulb—are "A" bulbs. Your lamp or fixture’s socket will dictate which cap or base a light bulb needs in order to fit, but there are a number of different base types and sizes to choose from, and it’s not always easy to determine which type is right for your fixture. The B and C groups: B10, C7, C9, C15, CA10. If you see a metallic base with screw threads, approximately 1 inch in diameter, you most likely have an E26 bulb. Keep up the good work. Unlike in the case of the light bulb shapes, the number in the light bulb base indicates the light bulb base diameter in millimeters, for instance, the candelabra E12 has a diameter of 12 millimeters. Intermediate: E17 North America, E14 (Small ES, SES) in Europe. It refers to 26 millimeters (which is 1 inch). Screw in bulbs use a base called an Edison Screw or ES base. All Rights Reserved. A light bulb’s series indicates its shape, followed by a number code that indicates the light bulb’s diameter in millimeters or one-eighths of an inch, depending on the type. Coronavirus (COVID-19) Update: Bulbs.com is committed to health and safety. In an incandescent or halogen screw base light bulb, two contact wires link the filament to the base where the electrical voltage is connected to the bulb. Which Type of Light Bulbs Should be Considered Eco-Friendly? Light bulb bases and sockets are normally defined by a letter-number-letter format, with the last letter optional. But how can I tell if the bulb I am holding in my hand is an E-10, E-27, E-40? Samantha is a copywriter/blogger at Super Bright LEDs, Inc. She graduated from the University of Missouri with a bachelor's in journalism and currently lives in St. Louis with her husband. The medium E26 base is the most common light bulb base. Bulbs with these bases are commonly used for appliance lights, such as microwave lights, refrigerator lights, and range hood lights. There are tens of unique bases for light bulbs. B and C-shaped bulbs. The number refers to the diameter of the base in millimeters. So a bulb with an E26 base is 26 millimeters. PAR (parabolic aluminized reflector) spotlight and flood light bulbs: PAR16, PAR20, PAR30, PAR38, BR (bulged reflector) spotlight and floodlight bulbs: BR20, BR30, BR40. The most common screw base sizes are E5, E-5, E10, E-10, E11, E-11, E12, E-12, E14, E-14, E17, E-17, E26, E-26, E27, E-27, E39, E-39, E40 and E-40. Medium – Standard base code: E26