Understanding common household light bulb shapes, sizes, and styles is important whether you’re converting outdated incandescent fixtures into energy-efficient ones or using LED bulbs for new-construction applications.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:

Usually, around this time people are giving up on their New Year’s resolutions. We get it; it’s tough to follow through on difficult commitments, especially when it comes to altering habits. Let et us be the voice that says, “Keep going! You can do this!” Or, maybe you’re still struggling to come up with a resolution. That’s where we come in. Resolve to be more energy efficient!

We’ve come up with several New Year’s resolutions we truly think you can keep. Energy efficiency doesn’t always require a significant monetary investment; sometimes, it calls for a small change in your routine. We know that change can be scary, but once you realize your savings potential, we hope that the challenge will be worth it!

Whether your home is old or new, there are probably some things you would like to change about it. While the layout and existing construction is often the first thing you think of, wouldn’t it be nice to make your work for you a bit more? If you have been dealing with a breaker that trips frequently or have to turn off everything in order to use a certain tool or appliance that is a bit of an energy hog, you could probably benefit from an electric panel upgrade. An electrician in Pasadena, like those at The Electric Connection, can help bring your home up to your electrical standards.

If your home is older (more than 50 years) it wouldn’t hurt to have an electrical inspection. During the inspection, the condition of your wiring will be evaluated to determine if your electrical problems may be due to faulty or deteriorating wires. You have to imagine 50 years ago, the average home had a handful of items that needed electricity. Today, almost every outlet in the house is in use with various computer cords, cell phone chargers and a long list of gadgets that make our lives easier.

Because of this, your Pasadena electrical needs are a little different and an electric panel upgrade will support all the gadgets you need and want without having to share outlets or unplug everything so you can use one appliance. In some cases, the panel itself may be just fine and you will just need an additional breaker installed. All of this can be determined after the electrician does the inspection and talks with you about what your needs are. From there, you can make a decision about what will work best for you. When you are ready or if you would like to learn more about an electric panel upgrade, give The Electric Connection a call today.

Ever considered utilizing solar energy in your Maryland home? If not, you might give it a glance. Not only is solar energy tech really quite cool, it boasts some unique benefits as well. But, of course, like any decision you make about the home, it all really boils down to its effectiveness, and possibly more importantly, the cost.

At Kolb Electric, we want to bring you all of the latest information and tech! Our team is excited about the advent of solar energy, and sharing what we know is just part of the superior service we provide.

When being used? Practically nothing, aside from maintenance. For solar energy, it’s all about the installation. While solar power isn’t exactly a new thing, implementing it in a larger capacity in United States homes kind of is. In a mainstream sense, at least. Preppers, ingenuitive farmers, and tech nerds have been using it for years.

So, as a reasonably newer need, solar tech installation, such as panels and solar-supported equipment are understandably rather expensive. Assume your home uses the US average amount of electricity (between 600 and 800 kWh) per month. With this estimate, assume you’re wanting you fully solar your home.

You’d be looking at anywhere between $20,000 to $40,000. Do understand that this is a very broad estimate, as individual factors about your home can lower or raise that drastically. There is an endless number of variables involved here, including how much power you want, how large your home is, your solar energy needs, etc.

You would also have to take into account maintenance, as solar equipment will require very specialised training and tools to keep working at maximum potential. Bottom line, how much does solar energy cost? Next to nothing, if anything at all. The equipment, on the other hand, we…it’s an investment.

But Is Solar Energy Worth It in Washington, DC?

Above is a map of average energy savings in the US, courtesy of Energysage.

Depending on exactly how you’re going to utilize the solar power, probably yes. Especially (and almost exclusively) if you intend to make your current home permanent. As in you plan on staying there for fifteen, twenty years. To find more exact answers and suss out whether solar power might be something you’re interested, we would highly recommend consulting an energy specialist.

Need superior electrical services in Maryland, DC, or Virginia? Contact Kolb today!