The A refers to the bulb shape. A is for arbitrary and is the shape that we all think of when we envision a light bulb (C is for candle, G is for Globe, etc.) The number 19 designates the size.

When we head out to our local hardware store to purchase a new light bulb, we rarely think about the name of the light bulb that we are going to get. We are more concerned with figuring out what ...

Buying a light bulb can be complicated. If you don't take the time to figure out what type of bulb you need, it may not match the color of the other bulbs in the room or even work in your fixture.