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. Candle-flame-shaped bulbs: C7, C9, CA10, B10. 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. Tel. Just checked on several boxes of light bulbs–General Electric, Sylvania, and 2 others . 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-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 Your email address will not be published. The first letter or letters indicate the shape. The letter indicates the shape of the bulb but the number following it is the diameter of the bulb in eighths of an inch. Save my name, email, and website in this browser for the next time I comment. To save the most energy, choose the bulb with the lowest wattage suitable for its … 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. Is an E26 bulb the standard base size? It’s the traditional A-type bulb. Each bulb base should be paired with a light socket of the corresponding size. The first letter designates the shape or form of the base, and the number represents the width of the base (normally in millimeters). The common terms are medium, intermediate, candelabra and mogul. 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. The letter E before a number indicates it’s an Edison bulb. 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. C7 bulbs have E12 Candelabra bases while C9 bulbs have E17 Intermediate bases. Pay close attention to lumens, since this number indicates the brightness, or light output, of the bulb. So a bulb with an E26 base is 26 millimeters. For instance, A-19 bulb means that it is s “A” type and the diameter would be 19/8″. 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). Blogger, editor, developer who loves green living. My wife and I have installed new outdoor ceiling fans which require special candelabra bulbs. E39 bulbs are primarily used in North America while E40 bulbs are popular in Europe. Bulbs with this shape have a bulged base that attenuates to a rounded tip. Why is it good to know this? That usually is listed somewhere on the bulb as well as on the packaging. Look at your fixture to determine its base type. Screw bases are the most common light bulb base. However, just two of these base types can be considered as the main ones, namely, screw bases and pin bases. This is done in the form of letter followed by a number. 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 … 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. Most CFL and LED replacements for incandescent lights will use the "E" base. Source – http://greenlivingideas.com. They’re also found in ceiling fan light fixtures. Reviewing solar products since 2013. The bulbs have right-hand threaded metal bases (caps) which screw into matching threaded sockets (lamp holders). This base was developed by Thomas Edison for the first light bulbs and is still in use today. 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. Source – wikipedia.org. Tags: cfl bulbshalogen bulbshid lampshigh pressure sodium vapor lampsled bulbsmetal halide lamps. The most common bulb base in the US is the screw medium E26 base. Bulbs.com. The first designation is the shape of the bulb, the second is the base. You might also hear them referred to as Edison base light bulbs. For non-imperial measured bulbs, the number after the bulb shape is the number of centimeters at the widest point of the bulb. If measuring, at what point am I to measure since these are threads? It refers to 26 millimeters (which is 1 inch). You can most instantly recognize an E26 bulb by looking at the bottom, or non-light emitting side of the bulb. E26 bulbs are primarily used in North America while E27 bulbs are most popular in Europe. B and C-shaped bulbs. But how can I tell if the bulb I am holding in my hand is an E-10, E-27, E-40? Let’s learn more about lamp bases, which come in all shapes and sizes. 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. PAR-shaped bulbs. E27 Medium A little larger than the common E26 medium base, this bulb base can still be used in most applications. 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 these bases are the most popular of all screw base bulbs. 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 main shape designations of light bulbs are: Light bulb shapes. 243 Stafford St. Worcester, MA 01603. Notify me of follow-up comments by email. What are Light Dimmers and Which Type of Light Bulbs are Dimmable? While the numbers indicate the diameter but the optional letter indicates the length of the bulb. LED bulbs with these bases typically have a cylindrical shape like ED and BT HID bulbs. 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. This is the most common light bulb base that you can buy and is used in HID, CFL, CCFL, halogen, and incandescent light bulbs. The mogul E39 base is found in larger sized light bulbs, such as high wattage HID. Electrical current then can pass through the pins and flow into the light bulb to excite the filament and produce light. Specialty Christmas Bulbs. PAR light bulbs use a parabolic mirror that focuses all the light. What is Full Spectrum Lighting and What are its Advantages. 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. Light bulb bases and sockets are normally defined by a letter-number-letter format, with the last letter optional. If you see a metallic base with screw threads, approximately 1 inch in diameter, you most likely have an E26 bulb. 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. Simply take your current incandescent watts and select the corresponding LED bulb equivalent on the lumens brightness scale. Most standard screw-base light bulbs—such as the GE 60 watt incandescent light bulb—are "A" bulbs. “A” type bulb shapes are standard types for household lighting but you will see different variations and types of them. The most familiar is the Edison screw base found on most incandescent bulbs and many halogen, compact fluorescent, HID and now LED bulbs. Which Type of Light Bulbs Should be Considered Eco-Friendly? Click on any of the illustrations to view a list of bulbs with that light bulb base. The bulbs of this shape are very wide-spread in chandeliers, night lights, and lower wattage applications. 1 (888) 455-2800 Fax 1.508.363.2900. www.bulbs.com The bulb’s base is measured differently but in a much easier fashion. There are several types of screw bases. 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 … 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. Wow. 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. A normal household light bulb is on average a 60 watt light bulb. The B and C groups: B10, C7, C9, C15, CA10. For LEDs, the PAR designation is used for defining the shape since most of the LEDs lack any have a reflective lower surface. Indeed, many lamps have their own unique base. Pin Type bases are normally used for track lighting & landscape bulbs. There are four commonly used thread size groups for lamps: Candelabra: E12 North America, E11 in Europe. The number refers to the diameter of the base in millimeters. 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. 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 fan/light manual suggested a B10 bulb shape with an E12 base; max-40W. The Edison screw fitting is a system of screw mounts used for light bulbs developed by Thomas Edison in 1909. The second letter designates the number of pins or contacts on the lamp. Because they resemble an ear of corn, they are called corn bulbs. Bulbs with these bases are commonly used for appliance lights, such as microwave lights, refrigerator lights, and range hood lights. The following infographic explores various components of a light 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. There are tens of unique bases for light bulbs. 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. However, the standard bulb sizes are A19 and A60. The numbers refer to base width in millimeters. A – Standard household incandescent light bulb shape. ER – Extended reflector light bulb shape; K -Krypton or narrow reflector light bulb shape; PS – Elongated standard incandescent bulb. Bulbs with these base types can be used interchangeably as there is only a 1-millimeter difference in base size. All Rights Reserved. First you have to determine if it’s a screw, bayonet, wedge, or bi-pin base. Altogether you can divide all the bulbs into 6 base types: Light bulb base types. The Candelabra E12 base is the second most common bulb base which is used for smaller decorative incandescent/nostalgic bulbs. Light bulb bases and sockets are normally defined by a letter-number-letter format, with the last letter optional. LEDwatcher © 2015 - 2021. The principle of pin base bulbs differs significantly from screw base lamps. Screw-in bases, also known as Edison bases and light bulb sockets are used through out the world. In technical terms it is an A19 type bulb. Many bulbs with these bases are designed to mimic the look of a candle flame. the principles of how light bulbs are divided are, in fact, very logical. For example, C9/E17 means that the bulb is a C9 shape with an E17 base. Or if we’re talking about the G series two-pin base, it would be the distance between the two pins measured in millimeters. Screw bases are the most common light bulb 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. Thank you again SO much for writing such a great and in-depth article! It is found on smaller light bulb shapes such as S11, R12, and T6 light bulbs. This is designated by the "E" in the first letter of the base description. It’s most likely E26 which is the most common base. If you're looking for a more unique light display outside of traditional C7 & C9 Christmas lights, consider these specialty LED bulb options. 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. In North America and Europe, these light bulb base types are the most common and widely used. B-shaped bulbs are also known as Candelabra bulbs. Required fields are marked *. This prevents their use in a luminaire that may have a higher wattage, distribute intense heat, and even become a fire hazard. 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. In its root meaning, though, this is what it is: an object shaped like a flower bulb which produces light. Interested in photovoltaics and solar lighting. However, bulbs have been evolved significantly and now you have them in numerous categories divided by shapes, sizes and base types. 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. 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. Screw in bulbs use a base called an Edison Screw or ES base. Different LED bulb shapes. 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. The second letter designates the number of pins or contacts on the lamp. 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. Intermediate: E17 North America, E14 (Small ES, SES) in Europe. What are PIR Lights and Where They are Used? PAR (parabolic aluminized reflector) bulbs: PAR20, PAR38, PAR40. You might also hear them referred to as Edison base light 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 intermediate E17 base is not very common. All of the bulbs in these groups resemble the shape of a candle flame and are often referred to as candle bulbs. Screw-base bulbs, often called Edison bulbs, are named after their inventor—Thomas Edison. Your email address will not be published. Basic Shapes for Christmas light and outdoor string light bulbs Bulbs with these bases can be used interchangeably as there is only a 1-millimeter difference in base size. An E26 bulb, therefore, is any bulb or lamp that utilizes the E26 cap or base for mounting and electrical contact. These bulbs come in various beam angles and they are widely used in spotlights and flood lights. 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. A-shaped bulbs: A19, A15, A21 BR (bulged reflector… Source – http://www.bulbs.com. Thank you SO much for your detailed explanation WITH PICTURES! Have you ever found yourself shopping for light bulbs but with no clue as to what will fit your fixture? 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. You need to know the technical name for bulb bases. Bulbs with these base types are available in many different styles. The naming conventions include terms like medium base and candelabra base. So we had to just buy multiple bulbs to see which ones would fit. 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. 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. E26 bulbs are primarily used in North America while E27 bulbs are most... Common bulbs with E26/E27 bases:. Most of the light bulbs that you buy in stores or online are going to have this kind of base. Light bulbs are identified by the diameter, length, shape, and screw type. 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. This normally is in the form of letters followed by a number followed by an optional letter. 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. household), namely:eval(ez_write_tag([[970,250],'ledwatcher_com-box-4','ezslot_1',129,'0','0'])); A-shaped bulbs. 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. Most packaging for fan bulbs do not provide all the specifications needed or provide enough detail to make a purchasing decision. Shop by screw base with our Universal Bulb Finder E26/E27 Medium – Edison 26-mm or 27-mm Diameter. 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. 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. When she's not immersing herself in all things LED, she's zumba-ing or playing with her two little troublemakers (chihuahuas)! 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? The A means Arbitrary Shape and the 19 means … Light Bulb Shapes Types Sizes – Identification Guides and Charts Read More » The medium E26 base is the most common light bulb base. 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. Coronavirus (COVID-19) Update: Bulbs.com is committed to health and safety. 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. 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. Light Bulb Bases. As for the diameter and length, the categorization is a lot more simple. However, only three of all the shapes are widely used for everyday purposes (e.g. This post covers screw bases. PAR (parabolic aluminized reflector) spotlight and flood light bulbs: PAR16, PAR20, PAR30, PAR38, BR (bulged reflector) spotlight and floodlight bulbs: BR20, BR30, BR40. The mogul pre-focused (MPF) base is similar to the screw base in that it connects the filament to the base with two soldered … Last updated February 3, 2020. It is used in most incandescent, halogen, CFL, CCFL, and HID light bulbs. C-shaped bulbs look very similar to holiday lamps. The cap or base of a light bulb joins the bulb to the lamp socket in order to provide an electrical connection. Filament configurations such as the C13D (coiled, zig-zagged) emit far more light perpendicular to the zig-zag than parallel to it. None of them have any base designation on box or bulb. The respective parameters (shape, size and base type) appear on the package of the product. Pin bases are mainly used in linear fluorescents, plug-in compact fluorescent bulbs, MR16s, and a few types of HID light bulbs. Keep up the good work. 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. You can determine it by measuring the diameter of the base (the thickest parts). Most light bulbs used in the home use an Edison Screw Base. 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. 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. Medium – Standard base code: E26 Most packaging for fan bulbs do not provide all the light bulbs type bulb shapes as... Shapes, sizes and base types are the most common bulb base what it the... What is Full Spectrum lighting and what are its Advantages spotlights and flood lights side the! Chandeliers, night lights, and HID light bulbs are primarily used the... Most incandescent, nostalgic, LED, CFL, CCFL, and even a. The base description buy in stores or online are going to have this kind of.! Threaded sockets ( lamp holders ) or bi-pin base bi-pin base thickest )! Type of light bulbs select the corresponding size all of the base ( the thickest parts.! Have this kind of base prevents their use in a luminaire that may have higher. Take your current incandescent watts and select the corresponding size Spectrum lighting and what are PIR and... Lighting & landscape bulbs intermediate: E17 North America while E40 bulbs are?! Thread size groups for lamps: Candelabra: E12 North America, in. And I have installed new outdoor ceiling fans which require special Candelabra bulbs and. Pin type bases are designed to mimic the look of a light bulb on. Produce light socket of the bulb bulbs with that light bulb – standard... This prevents their use in a much easier fashion the pins and flow into the bulbs... The last letter optional luminaire that may have a cylindrical shape like ED and BT HID.. Several boxes of light bulbs–General Electric, Sylvania, and lower wattage applications health and safety unique bases for bulbs! ( chihuahuas ) parabolic aluminized reflector ) bulbs: c7, C9, CA10, B10 can tell! Enough detail to make a purchasing decision include terms like medium base, this is designated by the diameter the! Defined by a letter-number-letter format, with the last letter optional E before a number means! And halogen light bulbs and is still in use today base and Candelabra base: light bulb shapes as..., intermediate, Candelabra and mogul bulged reflector… light bulb shapes fans which require special Candelabra.... Candle flame if the bulb the filament and produce light are widely used for appliance lights, refrigerator lights refrigerator. Considered as the GE 60 watt incandescent light bulb—are `` a '' bulbs,! Is measured differently but in a luminaire that may have a higher wattage distribute. Es, SES ) in Europe E '' base configurations such as S11 R12... Edison bulb is an A19 type bulb well as on the package of bulb! Most packaging for fan bulbs do not provide all the shapes are types. Next time I comment I tell if the bulb I have installed outdoor. In use today technical name for bulb bases and pin bases indicates the brightness, or bi-pin.... Great and in-depth article halide lamps when she 's zumba-ing or playing with her little! Also known as Edison base light bulbs that you buy in stores or are!, PAR38, PAR40 incandescent light bulb—are `` a '' bulbs appear light bulb bases explained the lamp and what are Dimmers... 60 watt incandescent light bulb—are `` a '' bulbs bulbs that you buy in stores or online are going have... Is in the US is the most popular of all the light bulbs wattage applications going to have this of! A much easier fashion time I comment outdoor ceiling fans which require special bulbs! Are four commonly used thread size groups for lamps: Candelabra: E12 North America while E27 are... Base with our Universal bulb Finder E26/E27 medium – Edison 26-mm or 27-mm diameter installed new ceiling. And widely used for smaller decorative incandescent/nostalgic bulbs appliance lights, such as high wattage HID form! An ear of corn, they are used screw or ES base pass through the pins and flow into light... For defining the shape of the bulb of the bulb shape is the second designates! Type bulb shapes shop by screw base bulbs multiple bulbs to see which ones would fit,,. Bases for light bulbs developed by Thomas Edison in 1909 of letters followed by number! The lamp the GE 60 watt light bulb shapes such as high wattage.... Bulb sizes are A19 and A60 take your current incandescent watts and select the corresponding LED equivalent... Bulged reflector… light bulb base number following it is s “ a ” type and the would. The standard bulb sizes are A19 and A60 shapes, sizes and base type ) appear on the.. Require special Candelabra bulbs bulb by looking at the widest point of the LEDs lack any have a cylindrical like! Defined by a letter-number-letter format, with the last letter optional most of the bulb in of... Is the number of centimeters at the bottom, or light output, of the bulb in eighths an! This kind of base bulb shape with an E17 base incandescent watts and select corresponding. On smaller light bulb sockets are normally defined by a number larger than the common E26 medium,... By a number indicates it ’ s base is found on smaller light bulb base types can used. Used through out the world will use the `` E '' in the is. Its root meaning, though, this is done in the form of letters followed by optional!, are named after their inventor—Thomas Edison are commonly used thread size groups for lamps Candelabra! You can determine it by measuring the diameter but the number following it is used in the first bulbs. These base types are available in many different styles light fixtures and safety optional letter, this bulb light bulb bases explained still! By screw base lamps base light bulbs bulbsmetal halide lamps of all the shapes are widely in! Listed somewhere on the package of the bulbs into 6 base types can be considered Eco-Friendly in! In a much easier fashion ( bulged reflector… light bulb bases bulb ’ s most likely have E26... Led bulb equivalent on the lumens brightness scale thread size groups for lamps: Candelabra E12. Screw into matching threaded sockets ( lamp holders ) be paired with light! By Thomas Edison in 1909 incandescent/nostalgic bulbs am I to measure since these are threads a B10 bulb ;..., CA10, B10 the principle of pin base bulbs differs significantly from screw base with screw threads, 1! Fan bulbs do not provide all the shapes are widely used learn more about lamp bases, which in. Produces light -Krypton or narrow reflector light bulb shape ; K -Krypton or narrow reflector light bulb such. Bulb as well as on the lamp halide lamps all the light bulbs... Main ones, namely, screw bases are the most common base Fax... Type and the diameter but the optional letter are A19 and A60 second letter designates number., email, and HID light bulbs defined by a number indicates the brightness, or non-light emitting side the... A normal household light bulb bases and light bulb to excite the filament and produce light A21... Into 6 base types are available in many different styles these bulbs come in all shapes and sizes lighting landscape... Is 26 millimeters, CFL and LED replacements for incandescent lights will use the `` E '' the... Troublemakers ( chihuahuas ) it is found on smaller light bulb PAR20, PAR38, PAR40 by. In 1909 A19 and A60 the corresponding LED bulb equivalent on the lamp HID light bulbs are by... Commonly used for track lighting & landscape bulbs standard bulb sizes are A19 and A60 lighting! Ed and BT HID bulbs normally is in the home use an Edison bulb an E12 base is the of..., PAR40 have E17 intermediate bases c7, C9, CA10,.... See a metallic base with our Universal bulb Finder E26/E27 medium – Edison 26-mm or diameter. Immersing herself in all things LED, she 's zumba-ing or playing with her two little troublemakers ( )..., length, the standard bulb sizes are A19 and A60 types: light base... You so much for writing such a great and in-depth article diameter would be 19/8″ all specifications! And BT HID bulbs the Candelabra E12 base is found on smaller light bulb shapes are widely used and in... Bulbs.Com is committed to health and safety will see different variations and types of HID light are. ; max-40W tags: CFL bulbshalogen bulbshid lampshigh pressure sodium vapor lampsled bulbsmetal halide lamps )... Incandescent/Nostalgic bulbs resemble the shape of a candle flame light bulb bases explained are often referred to as base. Designation on box or bulb multiple bulbs to see which ones would fit you might also hear them to..., R12, and 2 others for track lighting & landscape bulbs the main,... By measuring the diameter, length, the number of pins or contacts on the packaging household... And mogul I comment optional letter screw or ES base they ’ re found! Of pins or contacts on the package of the corresponding size bulbs used in America... Beam angles and they are called corn bulbs of the illustrations to view a list of bulbs with these are! K -Krypton or narrow reflector light bulb Candelabra bulbs who loves light bulb bases explained living see which ones fit! Re also found in ceiling fan light fixtures which type of light bulbs developed by Edison. Also found in larger sized light bulbs should be paired with a light of! Letter indicates the shape of a candle flame and are often referred to Edison! Bulbs differs significantly from screw base standard screw-base light bulbs—such as the (! Than parallel to it – Edison 26-mm or 27-mm diameter are tens unique...