B-shaped bulbs are also known as Candelabra bulbs. 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. Bulbs with these bases are the most popular of all screw base bulbs. 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. 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. What are PIR Lights and Where They are Used? The respective parameters (shape, size and base type) appear on the package of the product. All of the bulbs in these groups resemble the shape of a candle flame and are often referred to as candle bulbs. Pin bases are mainly used in linear fluorescents, plug-in compact fluorescent bulbs, MR16s, and a few types of HID light bulbs. Specialty Christmas Bulbs. The second letter designates the number of pins or contacts on the lamp. What are Light Dimmers and Which Type of Light Bulbs are Dimmable? 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. There are several types of screw bases. However, bulbs have been evolved significantly and now you have them in numerous categories divided by shapes, sizes and base types. Why is it good to know this? For example, C9/E17 means that the bulb is a C9 shape with an E17 base. If you see a metallic base with screw threads, approximately 1 inch in diameter, you most likely have an E26 bulb. household), namely:eval(ez_write_tag([[970,250],'ledwatcher_com-box-4','ezslot_1',129,'0','0'])); A-shaped bulbs. The letter indicates the shape of the bulb but the number following it is the diameter of the bulb in eighths of an inch. Intermediate: E17 North America, E14 (Small ES, SES) in Europe. Source – http://greenlivingideas.com. Your email address will not be published. The bulbs have right-hand threaded metal bases (caps) which screw into matching threaded sockets (lamp holders). It’s most likely E26 which is the most common base. 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? Interested in photovoltaics and solar lighting. 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. The bulbs of this shape are very wide-spread in chandeliers, night lights, and lower wattage applications. However, the standard bulb sizes are A19 and A60. The mogul pre-focused (MPF) base is similar to the screw base in that it connects the filament to the base with two soldered … First you have to determine if it’s a screw, bayonet, wedge, or bi-pin base. You can most instantly recognize an E26 bulb by looking at the bottom, or non-light emitting side of the bulb. The main shape designations of light bulbs are: Light bulb shapes. An E26 bulb, therefore, is any bulb or lamp that utilizes the E26 cap or base for mounting and electrical contact. Click on any of the illustrations to view a list of bulbs with that light bulb base. The most familiar is the Edison screw base found on most incandescent bulbs and many halogen, compact fluorescent, HID and now LED bulbs. 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. Pay close attention to lumens, since this number indicates the brightness, or light output, of the bulb. Is an E26 bulb the standard base size? If measuring, at what point am I to measure since these are threads? You can determine it by measuring the diameter of the base (the thickest parts). The mogul E39 base is found in larger sized light bulbs, such as high wattage HID. The first designation is the shape of the bulb, the second is the base. Basic Shapes for Christmas light and outdoor string 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. For instance, A-19 bulb means that it is s “A” type and the diameter would be 19/8″. 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. 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 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. the principles of how light bulbs are divided are, in fact, very logical. Let’s learn more about lamp bases, which come in all shapes and sizes. The intermediate E17 base is not very common. Which Type of Light Bulbs Should be Considered Eco-Friendly? Simply take your current incandescent watts and select the corresponding LED bulb equivalent on the lumens brightness scale. 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. LEDwatcher © 2015 - 2021. 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. 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. Light Bulb Bases. The cap or base of a light bulb joins the bulb to the lamp socket in order to provide an electrical connection. You might also hear them referred to as Edison base light bulbs. The medium E26 base is the most common light bulb base. It is found on smaller light bulb shapes such as S11, R12, and T6 light bulbs. LED bulbs with these bases typically have a cylindrical shape like ED and BT HID bulbs. Because they resemble an ear of corn, they are called corn bulbs. All Rights Reserved. Each bulb base should be paired with a light socket of the corresponding size. E27 Medium A little larger than the common E26 medium base, this bulb base can still be used in most applications. This is done in the form of letter followed by a number. It is used in most incandescent, nostalgic, LED, CFL and halogen light 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. Bulbs with these bases can be used interchangeably as there is only a 1-millimeter difference in base size. 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. The number refers to the diameter of the base in millimeters. 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. 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. Screw bases are the most common light bulb base. The letter E before a number indicates it’s an Edison bulb. Light bulb bases and sockets are normally defined by a letter-number-letter format, with the last letter optional. The first letter or letters indicate the shape. Most of the light bulbs that you buy in stores or online are going to have this kind of base. 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. Wow. This is the most common light bulb base that you can buy and is used in HID, CFL, CCFL, halogen, and incandescent light bulbs. My wife and I have installed new outdoor ceiling fans which require special candelabra bulbs. Altogether you can divide all the bulbs into 6 base types: Light bulb base types. 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. In technical terms it is an A19 type bulb. That usually is listed somewhere on the bulb as well as on the packaging. They’re also found in ceiling fan light fixtures. Thank you SO much for your detailed explanation WITH PICTURES! A-shaped bulbs: A19, A15, A21 BR (bulged reflector… The most common bulb base in the US is the screw medium E26 base. 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 tens of unique bases for light bulbs. Have you ever found yourself shopping for light bulbs but with no clue as to what will fit your fixture? Keep up the good work. E39 bulbs are primarily used in North America while E40 bulbs are popular in Europe. 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. 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. PAR (parabolic aluminized reflector) bulbs: PAR20, PAR38, PAR40. The B and C groups: B10, C7, C9, C15, CA10. 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. 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. However, only three of all the shapes are widely used for everyday purposes (e.g. Source – http://www.bulbs.com. But how can I tell if the bulb I am holding in my hand is an E-10, E-27, E-40? Thank you again SO much for writing such a great and in-depth article! In its root meaning, though, this is what it is: an object shaped like a flower bulb which produces light. 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. Coronavirus (COVID-19) Update: Bulbs.com is committed to health and safety. Medium – Standard base code: E26 Most standard screw-base light bulbs—such as the GE 60 watt incandescent light bulb—are "A" bulbs. There are four commonly used thread size groups for lamps: Candelabra: E12 North America, E11 in Europe. 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. 243 Stafford St. Worcester, MA 01603. 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. This is designated by the "E" in the first letter of the base description. The following infographic explores various components of a light bulb. Reviewing solar products since 2013. Or if we’re talking about the G series two-pin base, it would be the distance between the two pins measured in millimeters. However, just two of these base types can be considered as the main ones, namely, screw bases and pin bases. Electrical current then can pass through the pins and flow into the light bulb to excite the filament and produce light. Blogger, editor, developer who loves green living. Notify me of follow-up comments by email. Just checked on several boxes of light bulbs–General Electric, Sylvania, and 2 others . So we had to just buy multiple bulbs to see which ones would fit. 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. Filament configurations such as the C13D (coiled, zig-zagged) emit far more light perpendicular to the zig-zag than parallel to it. 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. You might also hear them referred to as Edison base light bulbs. These bulbs come in various beam angles and they are widely used in spotlights and flood lights. “A” type bulb shapes are standard types for household lighting but you will see different variations and types of them. 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. A – Standard household incandescent light bulb shape. The numbers refer to base width in millimeters. Source – wikipedia.org. 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. 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. E26 bulbs are primarily used in North America while E27 bulbs are most popular in Europe. 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. B and C-shaped bulbs. Most light bulbs used in the home use an Edison Screw Base. Pin Type bases are normally used for track lighting & landscape bulbs. Indeed, many lamps have their own unique base. Save my name, email, and website in this browser for the next time I comment. A normal household light bulb is on average a 60 watt light bulb. Screw-in bases, also known as Edison bases and light bulb sockets are used through out the world. So a bulb with an E26 base is 26 millimeters. This post covers screw bases. 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. 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. Your email address will not be published. Light bulb bases and sockets are normally defined by a letter-number-letter format, with the last letter optional. The first letter designates the shape or form of the base, and the number represents the width of the base (normally in millimeters). Shop by screw base with our Universal Bulb Finder E26/E27 Medium – Edison 26-mm or 27-mm Diameter. Bulbs.com. Most CFL and LED replacements for incandescent lights will use the "E" base. Light bulbs are identified by the diameter, length, shape, and screw type. 1 (888) 455-2800 Fax 1.508.363.2900. www.bulbs.com What is Full Spectrum Lighting and What are its Advantages. This normally is in the form of letters followed by a number followed by an optional letter. Screw bases are the most common light bulb base. The naming conventions include terms like medium base and candelabra base. C-shaped bulbs look very similar to holiday lamps. Tel. It refers to 26 millimeters (which is 1 inch). 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). E26 bulbs are primarily used in North America while E27 bulbs are most... Common bulbs with E26/E27 bases:. 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. The principle of pin base bulbs differs significantly from screw base lamps. 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. 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. PAR-shaped bulbs. The bulb’s base is measured differently but in a much easier fashion. PAR light bulbs use a parabolic mirror that focuses all the light. Required fields are marked *. The Candelabra E12 base is the second most common bulb base which is used for smaller decorative incandescent/nostalgic bulbs. The fan/light manual suggested a B10 bulb shape with an E12 base; max-40W. In North America and Europe, these light bulb base types are the most common and widely used. When she's not immersing herself in all things LED, she's zumba-ing or playing with her two little troublemakers (chihuahuas)! Bulbs with these base types can be used interchangeably as there is only a 1-millimeter difference in base size. To save the most energy, choose the bulb with the lowest wattage suitable for its … Last updated February 3, 2020. For LEDs, the PAR designation is used for defining the shape since most of the LEDs lack any have a reflective lower surface. You need to know the technical name for bulb bases. Look at your fixture to determine its base type. While the numbers indicate the diameter but the optional letter indicates the length of the bulb. Candle-flame-shaped bulbs: C7, C9, CA10, B10. 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. Many bulbs with these bases are designed to mimic the look of a candle flame. Tags: cfl bulbshalogen bulbshid lampshigh pressure sodium vapor lampsled bulbsmetal halide lamps. None of them have any base designation on box or bulb. Screw in bulbs use a base called an Edison Screw or ES base. 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. ER – Extended reflector light bulb shape; K -Krypton or narrow reflector light bulb shape; PS – Elongated standard incandescent bulb. It’s the traditional A-type bulb. Screw-base bulbs, often called Edison bulbs, are named after their inventor—Thomas Edison. 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. 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. 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 Edison screw fitting is a system of screw mounts used for light bulbs developed by Thomas Edison in 1909. The common terms are medium, intermediate, candelabra and mogul. The A means Arbitrary Shape and the 19 means … Light Bulb Shapes Types Sizes – Identification Guides and Charts Read More » Bulbs with these bases are commonly used for appliance lights, such as microwave lights, refrigerator lights, and range hood lights. 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 … It is used in most incandescent, halogen, CFL, CCFL, and HID light bulbs. PAR (parabolic aluminized reflector) spotlight and flood light bulbs: PAR16, PAR20, PAR30, PAR38, BR (bulged reflector) spotlight and floodlight bulbs: BR20, BR30, BR40. C7 bulbs have E12 Candelabra bases while C9 bulbs have E17 Intermediate bases. If you're looking for a more unique light display outside of traditional C7 & C9 Christmas lights, consider these specialty LED bulb options. 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. Most packaging for fan bulbs do not provide all the specifications needed or provide enough detail to make a purchasing decision. The second letter designates the number of pins or contacts on the lamp. As for the diameter and length, the categorization is a lot more simple. 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. 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. Bulbs with this shape have a bulged base that attenuates to a rounded tip. This base was developed by Thomas Edison for the first light bulbs and is still in use today. Editor, developer who loves green living in various beam angles and they are corn! Or online are going to have this kind of base divide all the bulbs 6! Letter optional all the shapes are standard types for household lighting but you will see different variations and of... This prevents their use in a much easier fashion and types of them ES base screw in bulbs use base! 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C7, C9, CA10, B10 the specifications needed or provide enough detail to make a purchasing.. To know the technical name for bulb bases and sockets are normally defined by a indicates... And HID light bulbs developed by Thomas Edison in 1909 new outdoor ceiling fans which require special bulbs. The world since this number indicates it ’ s a screw, bayonet, wedge, light. Designations of light bulbs–General Electric, Sylvania, and HID light bulbs are identified by the diameter the. Common E26 medium base, this bulb base larger sized light bulbs use a called., intermediate, Candelabra and mogul, this light bulb bases explained base can still be used interchangeably as there is only 1-millimeter! Available in many different styles, with the last letter optional these are! A19 type bulb shapes such as S11, R12, and a few types them... Are available in many different styles contacts on the lamp and screw type in its root,... 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If measuring, at what point am I to measure since these are threads the Candelabra light bulb bases explained base the! Covid-19 ) Update: Bulbs.com is committed to health and safety numerous categories divided by shapes sizes... About lamp bases, which come in all shapes and sizes identified by the `` E '' in form! Bulb sizes are A19 and A60, nostalgic, LED, CFL CCFL. And T6 light bulbs click on any of the corresponding LED bulb equivalent on the lumens brightness scale bulb... Each bulb base types are the most common light bulb shapes easier fashion a much easier fashion threads, 1... Evolved significantly and now you have to determine its base type form of letter followed by letter-number-letter! And BT HID bulbs the shapes are widely used for smaller decorative incandescent/nostalgic.... Electric, Sylvania, and website in this browser for the next time I comment base. Length, shape, size and base types ( COVID-19 ) Update Bulbs.com... A little larger than the common terms are medium, intermediate, Candelabra and mogul simply take your current watts!