What is The Difference Between A19 and A21 LED Bulbs?

What is The Difference Between A19 and A21 LED Bulbs?

LED lighting has revolutionized the way we illuminate our homes and businesses. It's energy-efficient, long-lasting, and environmentally friendly. When it comes to LED bulbs, you may have come across different options like A19 and A21. But what exactly do these options mean, and how do these bulbs differ from each other? If are you looking for the same question then this blog is best for you today. As we are going to explore both these options in great detail. So, let us start. 

Understanding LED Bulbs

Before delving into the answer to “What is the difference between A19 and A21 LED bulbs”, let's start with a brief overview of LED technology. LED stands for "Light Emitting Diode," and it is a semiconductor device that emits light when an electric current passes through it. LEDs are highly efficient, consuming significantly less energy than traditional incandescent bulbs, and they last much longer.

A19 LED Bulbs

A19 LED bulbs are a common choice for residential lighting. They are characterized by their compact and versatile design. If you are looking for features of A19 bulbs, here are some key features of A19 LED bulbs:


A19 bulbs have a standard, pear-shaped design with a medium E26 base.


They typically measure around 2.375 inches in diameter and 4.25 inches in length.


A19 LED bulbs come in various brightness levels, making them suitable for a range of applications.

Beam Angle

The beam angle can vary but is often around 220 degrees.

  • A19 bulbs are ideal for general lighting in homes, such as table lamps, pendant lights, and ceiling fixtures.

A21 LED Bulbs

Let us now move on to our next option. A21 LED bulbs, on the other hand, offer some distinct characteristics:


A21 bulbs are slightly larger and have a wider diameter compared to A19 bulbs.


They usually measure around 2.625 inches in diameter and 5 inches in length.


A21 LED bulbs tend to be brighter, making them suitable for spaces that require ample illumination.

Beam Angle

The beam angle is often wider, typically around 270 degrees.

  • A21 bulbs are ideal for larger fixtures, such as floor lamps, ceiling fans, and pendant lights.

Key Differences Between A19 and A21 LED Bulbs

The wait is over and now revealing the answer to the “What is the difference between A19 and A21 LED bulbs”. For your ease, we have shown both the bulb's differences in separate headings. If you want to get a full understanding of these bulbs, reading the below headings can prove vital. 

Size and Shape

One of the most apparent differences is the size and shape of these bulbs. A19 bulbs are more compact and have a standard pear-shaped design, while A21 bulbs are larger and have a wider diameter.


A21 bulbs are generally brighter than A19 bulbs. If you need a light source for a larger room or an area that requires more intense illumination, A21 bulbs are the better choice.

Beam Angle

A21 bulbs also tend to have a wider beam angle. This means they distribute light over a broader area, making them suitable for fixtures that need to illuminate a larger space.

The choice between A19 and A21 LED bulbs depends on the specific lighting needs of a room or space. A19 bulbs are versatile and work well for general lighting, while A21 bulbs are better suited for larger fixtures that require more brightness.

Energy Efficiency

Both A19 and A21 LED bulbs are highly energy-efficient. They consume less electricity and produce minimal heat, helping you reduce your energy bills and carbon footprint.


These LED bulbs are typically compatible with standard E26 bases, making them easy to install in most fixtures.


LED bulbs, regardless of their type, have a long lifespan, often lasting tens of thousands of hours. This means you won't need to replace them as frequently as traditional bulbs.

Cost Comparison

A21 LED bulbs are generally more expensive than A19 bulbs due to their larger size and higher brightness. However, the initial cost is offset by their energy savings and longer lifespan.

Choosing the Right LED Bulb

After getting the answer “What is the difference between A19 and A21 LED bulbs, and you are still confused about choosing which bulb, let us help you. To choose between A19 and A21 LED bulbs, consider the room's size and lighting requirements. If you are looking for more explanation, there is a whole section below for your guidance. 


Understanding the brightness of LED bulbs is key. Both A19 and A21 bulbs come in various lumens, which determine how bright they are. For general lighting in a room, you might prefer higher lumens, while lower lumens work well for accent or mood lighting.

Color Temperature

The color temperature of LED bulbs is measured in Kelvins (K). For A19 or A21 fixtures, you can choose warmer temperatures (around 2700-3000K) for a cozy ambiance, or cooler temperatures (4000K and above) for a more work-oriented space.

Bulb Shape and Size

A19 and A21 bulbs have distinct shapes and sizes. A19 bulbs are more compact, resembling the traditional pear shape, while A21 bulbs are slightly larger. Ensure the bulb's shape and size fit your fixtures.


If you plan to use dimmer switches with your A19 or A21 LED bulbs, it's important to select dimmable options. Not all LED bulbs are compatible with dimmers, so be sure to check this feature.

Energy Efficiency

Both A19 and A21 LED bulbs are known for their energy efficiency. Look for energy-saving certifications like Energy Star to ensure your bulb is eco-friendly and cost-effective. LED bulbs consume significantly less electricity than traditional incandescent bulbs.


Check if the LED bulb's base, typically E26, matches your A19 or A21 fixtures. Compatibility ensures a hassle-free installation process.

If you are looking for the best quality and long-lasting A19 and A21 LED bulbs in Canada, then Cymak LED is the best option. They offer top-notch products and extremely customer-friendly prices. We suggest you go through the extensive collection of A19 and A21 bulbs at Cymak LED and find the best ambiance for your space. 


Understanding the answer to “What is the difference between A19 and A21 LED bulbs can help you make informed decisions about lighting. In conclusion, get to know about your space requirements and choose the LED that best fits it. 

Frequently Asked Questions (FAQs)

  • Are A19 and A21 LED bulbs compatible with dimmer switches?
  • Yes, many A19 and A21 LED bulbs are dimmable, but it's essential to check the product specifications to ensure compatibility.

  • Do A21 LED bulbs use more electricity due to their higher brightness?
  • A21 LED bulbs may consume slightly more electricity than A19 bulbs, but the energy savings still outweigh the difference.

  • Can I use A19 and A21 LED bulbs in outdoor fixtures?
  • Yes, you can use both types of LED bulbs in outdoor fixtures as long as they are rated for outdoor use.

  • Do A21 LED bulbs produce more heat than A19 bulbs?
  • No, both A19 and A21 LED bulbs produce minimal heat, which is one of the benefits of LED lighting.

  • What is the expected lifespan of A19 and A21 LED bulbs?
  • LED bulbs can last up to 25,000 to 50,000 hours, depending on the specific product and usage.