The most common G-shaped bulb is the large G30, which is predominantly used to border bathroom mirrors for vanity purposes. As circular bulbs, the lighting is primarily used in ornamental fixtures and chandeliers. They have a full, round shape and are available in various sizes. G-shaped bulbs are dubbed as “globe” or circular bulbs. Group A shape, size and code differencesĪ-shaped bulbs come in a variety of sizes, the four most popular include:Ī25 bulb: 25/8 = 3-1/8″ diameter Group G: G11, G14, G50, G30 Some of the most popular include A15, A19, A21, and A25.Ī-shaped bulbs work well in various applications but are most often used in lamps, hallways lights, ceiling lights, ceiling fans, vanity lights, and more. The number after the letter indicates the diameter of the bulb in eighths of an inch. In fact, the bulb’s shape hasn’t changed since Thomas Edison assembled the first commercial model in 1879!Īlthough the shape remains the same, there are variations in size. The main diameter classifications are:Ī-shaped bulbs are the most standard and widely used in the household. These codes will tell you if a bulb will fit in your fixture and if it’s the right shape. ER – Extended reflector light bulb shapeįollowing the letter is a number that corresponds to the bulb’s diameter in eighths of an inch.A – Arbitrary / standard household incandescent light bulb shape.These are some of the most common light bulb shapes you’ll find in your home: The letters are used to indicate the shape or special features such as reflector type. The bulb code begins with a letter/letters. To differentiate bulbs, they are identified by a series of letters and numbers, known as the “light bulb code.” If you understand bulb codes, you will know what kind of bulb you need right away! The lightbulb you use for your bedside lamp will be entirely different from the one used in your bathroom’s recessed fixtures, for example. What are the different types of smart light bulbs?Īs we mentioned, there is a range of light bulbs, each corresponding to different household fixtures. To help you understand the shapes and sizes you need for your new smart light bulb, we’ve created a useful 101 guide, so you know exactly what you’re looking for next time you need a new light bulb. Seeing a bunch of numbers and letters in a variety of combinations might make you want to stop before you even get started, but how light bulbs are divided is very logical and easy to follow once you know how! While it might seem slightly daunting, the variety of light bulb types is there to help you. Modern light bulbs can be used in a range of fixtures, each with its own size and shape compatibility. You only need to take a trip down the lighting aisle of your nearest home improvement store to see how many choices there are! Today, you have a variety of different fixtures divided by shape, size, and base type. But just like everything else, light bulbs have evolved. Indeed, this classic bulb-type is what most of us grew up using and is what many of us still use today. When it comes to light bulbs, most people envision a conventional bulb with an upside-down pear shape.
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