What Is A A21 Bulb

The incandescent light bulb or incandescent lamp makes light by passing electric current through a wire filament in a glass envelope filled with an inert gas.

What is a a21 bulb.

The a21 and a19 are extremely similar in appearance while a21 has a slightly longer neck and larger bulb which fits in most fixtures and occasions. The a19 has a diameter of 2 375 inches and a height of 4 13 inches. Now a bulb s power is usually measured in lumens. What does the term a21 mean.

While size may be the main and most obvious difference between the two bulbs they also have a difference in power. The a21 and a19 are extremely similar in appearance while a21 has a slightly longer neck and larger bulb which fits in most fixtures and occasions. In countries that use the metric system the a21 bulbs are also referred to as the a67 bulbs where 67 refers to the diameter in millimeters. So the light bulb that most of us have used in our homes here in the states is an a19 bulb with an e26 base.

The reason it s useful to know both the shape and base is because you can t just ask for one of these and get the bulb you re looking for. The length of an a21 bulb is usually 105 140 mm 4 1 5 4 inches long slightly longer than the a19 bulbs. You can find led bulbs that fit that description here or other types of bulbs here. The filament resists the electrical current and produces a glow incandesces.

A typical a19 is 2 375 inches in diameter 19 8 2 375 and 4 13 inches in height while an a21 is 2 625 inches in diameter 21 8 2 625 and about 5 inches in height. The name a21 consists of two parts the first letter and the two digit number. Although the size difference is negligible in most applications many buyers have been wanting to know why higher wattage household led bulbs are made in a larger size. The a19 and a21 are pear shaped led bulbs that offer a popular alternative to incandescent bulbs.

Those a shape bulbs normally have a medium bulb base which can be screwed into most residential light sockets usually in table lamps and ceiling fans. By definition an a21 bulb has a diameter of about 2 6 inches. On the other hand the a21 bulb has larger dimensions of 2 6225 inches in diameter and 5 inches in height. A 21 bulbs are twenty one 21 eighths of an inch in diameter or 2 625 inches or 66 675 millimeters.

A21 light bulbs are lesser known than their extremely popular counterpart the a19 bulb and are more commonly used for higher light output applications. A21 led light bulb a21 led light bulb specs. These a shape bulbs have a standard medium base that you can screw into ordinary residential light sockets and table lamps. Those a shape bulbs normally have a medium bulb base which can be screwed into most residential light sockets usually in table lamps and ceiling fans.