what is an a19 light bulb

An A19 light bulb is a type of light bulb that has a pear-like shape and a diameter of approximately 2.4 inches. The name A19 consists of two parts: the first letter "A" indicates the bulbs overall shape, while the two digits "19" following the letter tells the diameter of the bulb's widest point, which is measured in eighths of an inch. A19 bulbs are the most common type of light bulb and have been used since the era of incandescent light bulbs, and now CFL and LED light bulbs continue to use the same term. The standards that govern the dimensions and design of A19 light bulbs also dictate that it must use an E26 screw base. Therefore, all A19 lamps have an E26 base, but not all light bulbs that have an E26 base are of the A19 form factor. When shopping for bulbs, it is important to be careful of this difference to make sure you purchase the correct one for your light fixture.