Understanding common household light bulb shapes, sizes, and styles is important whether you’re converting outdated incandescent fixtures into energy-efficient ones or using LED bulbs for new-construction applications. Every light bulb has identifying characteristics that are represented by a letter or series of letters and a number; these are known as light bulb codes. The letter or letters in a bulb code indicate either shape or special features such as reflector type. Numbers in a bulb code indicate size in millimeters or eighths of an inch. These codes will tell you if a bulb will fit in your fixture and if it’s the right shape.

For every light fixture or application, there’s going to be a specific bulb or light bulb shape that will fit best and provide the right type of light. If you understand bulb codes, it’s easy to look at a light fixture and know right away what kind of bulb you’ll need.

Let’s talk about light bulb groups, their bulb codes, and what applications those bulbs are typically used for.

Standard/arbitrary (A) bulbs are the most widely used and thought of when it comes to household lighting. These bulbs work well for a variety of applications, such as ceiling lights, lamps, vanity lights, kitchen lights, closet lights, porch light fixtures, and so many more.

Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.

A15 bulb: 15/8 = 1-7/8″ diameter

A19 bulb: 19/8 = 2-3/8″ diameter

A21 bulb: 21/8 = 2-5/8″ diameter

A25 bulb: 25/8 = 3-1/8″ diameter

Most common base types:

Globe (G) bulbs have a full, round shape and are available in various sizes. They can be used for many applications throughout the home, such as foyer lights, kitchen lights, chandeliers, and ornamental fixtures. The most common type is the large G30 bulb, which is used in bathroom and makeup vanities.

Depending on the bulb, numbers in each code can refer to the bulb’s diameter in one-eighths of an inch or in millimeters.

G11 bulb: 11/8 = 1-3/8″ diameter

G14 bulb: 14/8 = 1-3/4″ diameter

G16/G50: 16/8 = 2″ diameter

G60: 60 millimeters = 2-3/8″ diameter

G25/G80: 80 millimeters = 3-9/64″ diameter

G30: 30/8 = 3-3/4″ diameter

Most common base types:

All of the bulbs in these groups resemble the shape of a candle flame and are often referred to as candle bulbs. Conical (C) bulbs are shaped like a cone. Conical angular (CA) bulbs are shaped like a cone but have a bent tip. Blunt-tip (B) bulbs are very similar to C-type bulbs but have more of a torpedo or bullet shape. These bulbs can be used in chandeliers, wall sconces, pendant lights, night lights, decorative light strands, holiday light strands, and other decorative home lighting applications.

Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.

B10 bulb: 10/8 = 1-1/4″ diameter

CA10 bulb: 10/8 = 1-1/4″ diameter

C7 bulb: 7/8 = 7/8″ diameter

C9 bulb: 9/8 = 1-1/8″ diameter

C15 bulb: 15/8 = 1-7/8″ diameter

Most common base types:

BR stands for bulged reflector. Traditionally, the inside surface of an incandescent BR bulb is covered in reflector material that is used to gather and cast a wide beam of light away from the bulb. LED BR bulbs don’t require the reflector material. These bulbs can have a frosted, clear, or patterned dome-shaped lens that diffuses light and provides a gradual fade into nonilluminated areas. BR bulbs also produce less shadows when compared to PAR bulbs. They’re a bit longer than PAR bulbs and tend to protrude from light housings but are used in similar applications, such as track lights, recessed lights, display lights, or can lights.

BR20 bulbs are often referred to as R20 but have the same characteristics of other BR bulb types. The R stands for reflector.

Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.

BR20/R20 bulb: 20/8 = 2-1/2″ diameter

BR30 bulb: 30/8 = 3-3/4″ diameter

BR40 bulb: 40/8 = 5″ diameter

Most common base type:

Multifaceted reflector (MR) bulbs are small in size with a reflective, faceted interior. The facets create a concentrated beam of light that can be displayed in a narrow spot or wide flood beam pattern. Because of the directional light they provide, MR LED bulbs don’t require the facets but often still have them. These bulbs are available in a variety of colors and can be used for many applications, including track lighting, recessed lighting, desk lights, and display case lighting. Many MR bulbs operate on low-voltage wiring systems, which makes them great for outdoor and landscape applications such as driveway lights, path lights, gazebo lights, paver lights, and malibu lights that have weatherproof housings.

Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.

MR11 bulb: 11/8 = 1-3/8″ diameter

MR16 bulb: 16/8 = 2″ diameter

Most common base types:

Tubular (T) bulbs come in a variety of lengths and widths. Depending on their size, these bulbs can be used in applications ranging from chandeliers, wall sconces, and pendant lights to basement and garage troffer light fixtures.

Numbers in each code refer to the bulb’s diameter in one-eighths of an inch.

T7 bulb: 7/8 = 7/8″ diameter

T8 bulb: 8/8 = 1″ diameter

T10 bulb: 10/8 = 1-1/4″ diameter

T14 bulb: 14/8 = 1-3/4″ diameter

Most common base types:

When you flick on the light switch, what happens? If you’re thinking “the room lights up… hopefully,” then you’re probably missing out on an opportunity for breathtaking lighting to do so much more than just let you see in the dark.

Your home should look intentional and deliberate, not just functional. Lighting is one of the best, easiest, and most easily ignored ways to make your home go from “nice place,” to “oh wow.” Seriously! Think back to the first time you saw under-cabinet lighting, for instance. Wow, talk about a way to get the most out of a space, while still showing off the best aspects out of the kitchen. That is exactly the effect that an inspired electrician can create, simply by optimizing your layout to handle some really nifty things with lighting. Even if you don’t decide to pull the trigger on the uplighting for your soon-to-come artwork, having the ability to add that in with little effort later thanks to a box hidden in the wall (just in case) takes almost no effort on our part, but can make a tremendous difference in your home’s perception, and value, down the road.

Light doesn’t just shine from one direction. Even sunlight is seen in the form of reflection, direct contact, and general ambient lighting. These simple principles are the same that should be used and recreated in your home. Your home should mirror that breathtaking view you saw on your favorite vacation, when the sunlight shone just so; conjure up that image, then imagine the architecture of your home and how it could be better illuminated. If you’re drawing a blank, don’t worry, that’s what our experienced electricians are here for. We’ll happily handle the up lighting, room lighting, and ambient lighting to create the effect that you’re looking for, even if you don’t really know how to explain it or where the circuits need to run. While all of this sounds expensive, creating a couple of extra lighting lines is simple when you’re already committing to work on your home, but becomes much more difficult later; always take advantage of the opportunity to bring an electrician and find out what is possible – 9 times out of 10, we find that homeowners who do this thank themselves for it later.

One of the biggest mistakes that builders and general contractors make is doing the bare minimum for lighting, leaving the home with nothing but a few can lights either dimly lighting the room or blinding everyone inside. Don’t let your lights let you down, or you’ll find that all your painting and furniture efforts just seem to fall flat of that wow factor you’re looking for.

Contact Electrical Gurus in Des Moines for the inspired, experienced service you need to create artistically inspired lighting for your home. When done right, you’ll find an incredible amount of value in a couple of lighting changes.

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The Risks of Falling for Scams

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The tips below can help you prevent scams and find an honest and qualified electrician in Plano, TX for your electrical repairs and installations.

Electric Man: Honest and Reliable Electricians Plano TX

Don’t allow yourself to fall victim to scams and phony electricians. Find a Plano electrician who will listen to your concerns, do the work that you asked for thoroughly, honestly and reliably, and who won’t take advantage of your needs. Electric Man has been providing Plano Tx electrician services to the Dallas/Fort Worth Metroplex area for over 27 years. Our services range from simple fixture installations and routine maintenance to major power emergencies. To learn more about Electric Man, call us today at 972-792-7270, visit us online or connect with our social media networks like Facebook and Twitter. If you have any other questions for Electric Man, leave in the comments section of our blog, and we’ll get right back to you!