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.

— Recommendations are independently chosen by Reviewed’s editors. Purchases you make through the links below may earn us and our publishing partners a commission. Home lighting—it can make or break a ...

Buying a light bulb is a little more complicated than it used to be. You can't just pick up a similar watt bulb and expect it will match the other bulbs in the room, or even work in your fixture. So ...