A-shaped bulbs are one of the most popular bulbs used in the home. They are so popular, the A-shape is probably what comes to mind when someone says light bulb. To tell the difference between one A-shaped bulb and another, the bulbs are classified based on their diameter.
As with any light bulb style, A21 bulbs are available in a variety of wattages, color temperatures, bases, and lumens. Many LED A21 bulbs are dimmable, which means they can be used with compatible dimmer switches. Dimmable bulbs are a great way to change the atmosphere in the room without having to change the lightbulb. There are also different outward appearances to A21 bulbs aside from the light emitted. Choose from clear and frosted styles depending on how you like the bulb to look when it's not lit.
LED A21 bulbs have a diameter of 2.625 inches and are the second largest of the A-shaped bulbs.
Types of A-Shaped Light Bulbs
LED light bulbs have many benefits when compared to other bulb formats, such as incandescents and CFLs (compact fluorescents). Compared specifically to CFLs, LED bulbs are more durable. A-shaped LED bulbs are also typically smaller than CFLs, making them suitable for more applications. In general, LED light bulbs have a longer life span and use less energy than other traditional lighting technologies. This helps save on energy costs, and is more convenient since bulbs do not need to be replaced as often. In applications where heat is a concern, LED bulbs are a great option because they stay cool with the lights on.
A21
After A19, A21 bulbs are the next most popular choice. With a diameter of about 2.6 inches, they are just slightly wider than A19 bulbs. Because of this similarity, A21 bulbs can be found in most of the same places A19s are, with their most popular use being around the home.
A15
With a diameter of 1.875 inches, A15 bulbs are the smallest of the A-shaped family. Their most popular use is in signs and decorative lighting.
A19
A19 bulbs are the most commonly used A-shaped bulb. From lamps to ceiling fixtures, bathroom vanities to sconces, and so much more, there’s a use for A19 bulbs in every room of your house. The A19’s diameter is approximately 2.4 inches.
A23
A23 bulbs are the largest of the A-shaped bulbs with a diameter of 2.875 inches. An A23 bulb typically has higher wattage than other A-shaped bulbs. This higher wattage makes the A23 a good choice for commercial uses that call for the traditional A-shape.
A25
A25 bulbs are the largest of the A-shaped bulbs with a diameter of 3.7 inches. An A25 bulb typically has a built-in heatsink for better heat dissipation than other A-shaped bulbs. This feature makes the A25 a good choice for commercial uses that call for the traditional A-shape.
