Common Light Bulb Types, Sizes and Shapes
Light bulbs come in various shapes and sizes, each designed for specific purposes and settings. Understanding the different types can help you choose the right bulb for your lighting needs. In this guide, we’ll explore some common light bulb types, their features, and where they are commonly used.
Light Bulb Size Chart
| Code | Description | Common Uses |
|---|---|---|
| A | Standard Household | (LED Availability ➡️ Yes) Fits most lamps and regular light fixtures |
| C | Candle | (LED Availability ➡️ Yes) Used in Chandeliers, decorative lights, and some appliances |
| R | Reflector | (LED Availability ➡️ Yes) Used in directional lighting, commonly in recessed fixtures |
| MR | Multifaceted Reflector | (LED Availability ➡️ Yes) Common in track lights |
| PAR | Parabolic Aluminized Reflector | (LED Availability ➡️ Yes) Used for focused Spot Lights |
| G | Globe | (LED Availability ➡️ Yes) Common in Pendant lights |
| T | Tubular | (LED Availability ➡️ Yes) Linear tubes, used in fluorescent lighting |
| S | Spherical | (LED Availability ➡️ Yes) Used for decorative purposes |
| ST | Straight Tubular | (LED Availability ➡️ Yes) Tubular shape with straight design |
| BT | Bulged Reflector | (LED Availability ➡️ Yes) Tubular shape with a bulge in the middle |
| CFL | Compact Fluorescent Lamp | (LED Availability ➡️ Yes) Similar to R- Shaped bulbs with a bulged shape |
The Most Common LED Bulb Types and Sizes
1: A19 – Standard Bulb Shape
The A19 bulb is the standard household bulb shape, fitting most lamps and regular light fixtures. It’s a versatile option suitable for various applications, providing general illumination.
2: E26 – Standard Medium Screw Base (Edison Base)
With widespread use in the U.S., the E26 base is a standard medium screw base that fits the majority of lamps and fixtures. It is the familiar Edison base and is commonly available in LED configurations.
3: E27 – Standard Medium Screw Base
Similar to E26, the E27 base is widely used worldwide, especially in Europe. It’s a common choice for lamps and fixtures, and LED options are readily available.
4: E12 – Candelabra Base
The E12 candelabra base is used in chandeliers, decorative lights, and some appliances. Its smaller size and unique shape make it ideal for accent lighting in various settings.
5: E17 – Intermediate Screw Base
The E17 intermediate screw base is used in specific fixtures and appliances. LED options are available, though they might be less common.
6: E14 – Smaller Candelabra Base
Common in European fixtures and smaller decorative lights, the E14 base is versatile and often found in LED configurations.
7: GU10 – Twist-and-Lock Base
The GU10 base is a twist-and-lock design commonly used in track lighting and recessed fixtures. LED GU10 bulbs are popular for their energy efficiency.
8: MR16 – Bi-pin Base
The MR16 bulb with a bi-pin base is frequently used in track and display lighting. LED versions are widely available, offering energy savings and versatility.
9: B22 – Bayonet Mount Base
The B22 bayonet mount base is common in the UK, Australia, and some other countries. LED bulbs with this base are readily accessible.
10: PAR20, PAR30, PAR38 – Parabolic Aluminized Reflector Shape
PAR bulbs are used for focused spotlighting in various settings. Available in different sizes, they are commonly used in both residential and commercial applications.
11: G9 – Bi-pin Base
The G9 base is used in decorative light fixtures and some appliances. LED G9 bulbs provide energy-efficient and aesthetically pleasing lighting.
12: R7s – Double-Ended Base
R7s bulbs with a double-ended base are used in linear fixtures, floor lamps, and some outdoor lighting. LED options are available for improved energy efficiency.
13: GU24 – Twist & Lock Base
The GU24 twist-and-lock base is an energy-efficient alternative to the standard screw base. It is commonly used with CFL and LED bulbs.
14: BA15d – Double Contact Bayonet
BA15d bulbs are used in automotive lighting. LED versions are available for enhanced durability and efficiency.
Light Bulb Shapes
1: E26 or E27 – The Standard Household Base
E26 and E27 bases are the used in household lighting. Widely considered the standard, you’ll find these bases in the majority of light bulbs available at stores.
Whether you’re lighting up your living room or bedroom, E26 or E27 bases are likely be the ones you’ll encounter the most.
2: E12 – Candelabra Base
Known as the candelabra base, E12 is designed for fixtures like chandeliers or any other setting that requires a touch of elegance.
If you have a chandelier or a similar fixture, keep an eye out for the distinctive E12 base.
3: E17 – Intermediate Base
E17 bases fall in between the common E26 and the smaller E12. While less common, you may find them in small table lamps or ceiling fans.
Keep an eye out for this intermediate base if you’re looking for bulbs for more specialized fixtures.
4: G4 or GU24 – Bi-Pin Base
Referred to as a Bi-Pin base, G4 or GU24 bulbs have two points of contact. You’ll often encounter these bases in kitchen lighting or under-cabinet lights.
The bi-pin design ensures a secure and stable connection in various settings.
5:GU10 – Twist-and-Lock Base
GU10 bases bring a unique twist to the traditional screw-in method. Known as the Twist-and-Lock base, GU10 bulbs are installed by turning them until they click into place.
This type is commonly used in kitchen lighting and offers a secure and efficient lighting solution.
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