Well, you need to decide the base of the light bulb carefully because that is what determines the light fixtures it can be fitted to. But still, many users prefer A19 bulb and they say it is more comfortable. So A21 bulb can manage the heat produced better than the A19. You might be wondering how can that be an advantage right? Well, as we said the larger the size, the more heat it can manage. So from the comparison of the above two it is clear that A21 is the winner because of its larger size. So it shows that it is a bit longer than the A19 Bulb. The dimensions in millimeters are 78.5mm in diameter and 139.7mm in length. The A21 light bulb has a radius of 1.3 inches and a diameter of 2.6 inches and its length if about 4.2 to 5.5 inches. The dimensions in millimeters are 112.7mm in length and 69.5mm in diameter. Similarly, the length of the light bulb is 3.9-4.3 inches. The A19 light bulb has a radius of 1.2 inches or a diameter of 2.4 inches.
So now as you how the name of a light bulb is decided, let us discover more. The size of the bulb is to be determined carefully to contain the heat that is generated by the bulb.
Because the width of the bulb determines the amount of light that is to be delivered throughout the room.Īnd whenever you are looking for a bulb for your table lamp, you need to know the exact dimension to make sure that the bulb fits within the lamp head. The width of the Light Bulb is the most important part. Do you know that the name of the bulb is determined by its design? The letter A represents the shape of the bulb, whereas the next 2 digits followed to show the diameter of the bulb at its widest point.
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