The A Series Bulbs are used in general purpose residential lighting, kitchen lights, porch lights, bathroom and closet lights. Some of the commonly sizes are A15, A19, A21, A25. They are one of the easiest lamps to manufacture and are available as clear glass or diffused (with a coating on the inside). Despite the changes in lighting technology, the shape of A Series Lamps is almost identical to the 19 th Century Incandescent lamps. It is one of the commonly used light bulb shapes for general lighting. The A Series or Arbitrary Series Lamps are one of the basic light bulb shapes. Let us now see some details about these different light bulb shapes. There are several more light bulb shapes but we felt that these are some of the commonly used and also the popular ones. The following is a list of 23 different light bulb shapes. NOTE: Click on the image for a larger size. These light bulb sizes and shapes are for demonstration purpose only and are not to scale. The following image illustrates some of the commonly found Light Bulb Shape Groups with different sizes in each group. So, A19 means 19 increments of 1/8 th of an inch or 2-3/8”. In the US, the number is usually in inches and it is in Millimeters, for the rest of the world.Īn important point to remember about the size of a light bulb in inches is it is measured in increments of 1/8 th of an inch. Here ‘A’ represents the shape of the bulb, which is Arbitrary in this case and ‘19’ is the diameter of the bulb at its widest point.
Similar to different light bulb base types and sizes, we also have different light bulb shapes for Incandescent, Halogen, Fluorescent (Compact and Tube), LEDs, etc.Įach light bulb shape has a name and this name, along with a number which represents the size, is used as a marking for the shape and size of light bulb, either on the bulb or on the packaging.įor example, a commonly used household bulb is an ‘A19’ lamp. We have already seen Different Light Bulb Bases in a previous article.
We will also try to build a Light Bulb Shapes Chart and also a Light Bulb Sizes Chart. First, we will see Different Light Bulb Shape and then see some of the frequently used light bulb sizes. With that being said, we will now learn about some of the commonly found light bulb sizes and shapes. Usually, if there are two bulbs of the same shape but different sizes, then the smaller bulb will be less powerful and less bright than the bigger bulb. The size of the light bulb determines the brightness of the light and also the power consumption. The shape of a light bulb determines the orientation of the light i.e., whether it is focused or spread at an angle or used for decorative purposes. Since amount and type of light is dependent on the purpose, we have so many light bulb shapes and sizes. Lights used in cars cannot be used as kitchen lights. The purpose of a street light is different from a light in the auditorium. But why do we need so many?ĭifferent lighting scenarios need different style of lighting. If you look at the catalogue of bulb manufacturers or their websites for list of products, then you can find hundreds of different types of light bulb sizes and shapes. Why There are So Many Different Types of lamps?
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