Light Bulb Base Sizes Chart, an Easy Guide

Fengxiang Li
2021-11-16T11:00:00-07:00

Our tutorial will teach you all you need to know about the typical light bulb socket size for your home's pendant lights and general lighting.
More

Even though light bulbs may seem simple, properly selecting any light bulb remains necessary to ensure effective lighting at home or in the working area. One important factor when making this decision is the light bulb base sizes.

Since there are different types of light bulb bases, understanding the differences can eliminate compatibility problems and ensure that one achieves the desired effect.

In this article, we will discuss why light bulb base sizes are important, their specific types, and how to choose the most appropriate for these dimensions.

Understanding Light Bulb Base Sizes

Light bulb base sizes are usually given in millimeters. This measure is critical as it helps measure the bulb’s socket and determines how well it will fit in there. There are mainly two types of measurements employed for light bulb bases: screw bases and pin bases.

Screw bases, one of the most common types, have a diameter and a letter designation (for example, E for Edison). Pin bases, on the other hand, are measured by the distance between their pins. Knowing some of these measures will help you buy the right bulb and ensure it fits the shared sockets perfectly.

However, even though most of the bases on light bulbs are standardized, they depend on the manufacturer and the type of light bulb. So, having a light bulb base sizes chart can indeed be very helpful, especially in the case of making any alterations in the lighting designs or fixing a bulb.

Why Size Matters

The size of the light bulb base is very important for several reasons. In the case of a mismatch, flickering lights would ensue, fixtures could be damaged or become a liability and cause short circuits, and so forth.

Additionally, the proper size means that the bulb will be able to emit the brightness and color temperature desired in that space, assisting in the overall orientation of the room in terms of feel and use.

Common Light Bulb Base Types

3. Edison Screw Base (E-Series)

One of the most common light bulb bases is the Edison screw base. It comprises several sizes designed for diverse uses:

E26: The most common base used within the USA in ordinary household bulbs. This base remains quite useful in applications with the need for table lamps, ceiling fixtures, and so on, which is why it is one of the most common light bulb base sizes.

E27: This base is slightly larger than the E26 and can be found in Europe and some parts of Asia. The bases are still compatible, but this base is meant for slightly different voltages.

E12: This bulb size is commonly found in decorative lighting, such as candelabra and string lights. Its smaller size effectively sets the mood in dining areas or during festive seasons.

E17: These bases are common in appliance bulbs and certain optimized appliances, such as stovetops and technical convection microwaves, usually in domestic refrigerators and microwaves that provide light in a small area.

Choosing the correct base size is important because selecting an incorrect one can lead to poor lighting or expensive corrections.

2. Pin Base

Pin bases are another category of light bulb bases that serve specific functions. The following are some of the usual types in this case:

GU10: These bulbs are used in recessed fixtures and track lights. They have a locking system where the bulb itself is twisted into place. This design is practical because of its simplicity and is less prone to damage even in a robust environment.

G4: G4 bulbs are usually used in low-voltage landscape and under-cabinet lighting systems. They are small and can fit into places where other conventional bulbs would not.

G9: Victorian-style light bulbs of this size are widely used in decorative chandeliers and lamp stands due to the size constraint. These lights are compact yet offer huge amounts of brightness that fit in with modern interiors.

Every type of pin base has specific uses which is why it is critical to select the right one for the fixture. Employing a light bulb base size comparison helps to determine which type will be most appropriate for certain lighting conditions.

Below is a summary of the light bulbs in table format to help you compare them side by side.

Bulb Base Type | Base Size (mm) | Common Uses | Key Features
E26 | 26 | Standard household bulbs (USA) | Widely used; compatible with many fixtures.
E27 | 27 | Household bulbs (Europe) | Similar to E26, slightly larger.
E12 | 12 | Candelabra fixtures, decorative lights | Smaller size for ambiance lighting.
E17 | 17 | Appliance bulbs, specialty fixtures | Compact; often used in appliances.
GU10 | 10 | Track lighting, recessed fixtures | Twist-and-lock mechanism; secure fit.
G4 | 4 | Landscape lighting, under-cabinet fixtures | Low voltage; compact design.
G9 | 9 | Decorative lighting, limited space | Bright output; small footprint.
GU24 | 24 | Energy-efficient lighting solutions | Twist-and-lock; easy installation.
B22 | 22 | Household fixtures (Australia, NZ) | Bayonet fitting; durable.

Specialty Light Bulb Bases

3. Twist-and-Lock Base

Twist-and-lock bases, such as the GU24 bases, are easy to install and are used mostly in energy-saving lighting. In these bases, the bulb is fixed by a simple quarter turn, thereby easing the procedure of removals and replacements of light bulbs. GU24 bulbs often have compact fluorescent and LED alternatives, helping save energy.

Furthermore, twist-and-lock bases tend to be more secure; therefore, a bulb is less likely to become loose over time. This is an important feature in high-traffic areas, other outdoor settings with a lot of movement, or outside where there might be vibrations.

2. Bayonet Base

Another specialty option found on modern products is the bayonet base. These consist of 2 pins on the base that fit into slots in the socket and need to be twisted to lock the bayonet base in.

This design is very common in Australia, New Zealand, and particular Asian countries for all kinds of lighting needs, from home lighting to outdoor ones.

It is important to remember that not all bayonet bases fit all fixtures so one should refer to a light bulb base sizes chart while selecting the bulbs.

Conclusion

All in all, knowing common light bulb base sizes is important as it helps you make sure that your lighting fixtures function as they are supposed to.

If people learn more about the different formats and sizes of the common light bulb bases, they will be in a better position to choose options that improve lighting. Those who wish to know more will find a light bulb base sizes chart quite handy.

It does not matter if you are improving the lighting of your house or you are buying bulbs for a new building project, always keep in mind that you must pick the appropriate base size to achieve the best results.

In order to enhance your lighting experience and select the perfect base sizes of LED bulbs for your home, you should definitely check out the wide variety of products available at Yeelight.

Since they manufacture smart lightings such as energy saving bulbs with adjustable temperature color, Yeelight has everything to light up your room.

Go to their store right now and see new light approaches designed specifically for you!