Bulb shapes and sizes pdf
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How to Select the Perfect Table Lamp - Lighting Size, Lamp Shade and Light Bulbs - Lamps Plus
A-series light bulb
The A-series light bulb is the "classic" glass light bulb shape that has been the most commonly used type for general lighting service GLS applications since the early 20th century. It has a pear-like shape and is typically fitted to either an Edison screw or a bayonet cap base. The number that follows the "A" designation indicates the nominal major diameter of the bulb, either in one-eighth inch units in the United States    or in millimeters in the rest of the world. Another common A-series light bulb type is the A15 bulb which is commonly used for appliances and ceiling fans. A-series light bulbs using the older B22 bayonet twist type base are less common; they can be found in the UK and many British Commonwealth countries. The same standard also defines in addition to the A shape also bulged B , conical C , elliptical E , flame F , Globular G , K , mushroom M , P , reflector R , straight-sided S and tubular T bulb shapes, as well as several modifier letters and special shapes. Very similar to the A shape are the P shape "A bulb having a spherical end section, and a conical mid section, the sides of which are tangent to the curve of the spherical section" , and its PS variant "Tubular neck section below the bulb and above the approximate reference line".
The names of light bulb shapes are denoted with a letter, which describes the shape, and a number, which indicates the size. The number associated with the shape indicates the diameter of the light bulb at its widest part in eighths of an inch. Appliance light bulbs are one of the most widely used shapes and can be used almost anywhere, including homes, hotels, and restaurants. Appliance light bulbs have the shape that most consumers think of when they picture a light bulb. Typical sizes include A15, A19, A21, and A Pear shape light bulbs are similar to A light bulbs, except they have a larger diameter, which causes the bulb to look like a pear. Typical sizes include PS30 and PS
Light Bulbs, also known as lamps in the industry, come in a vast variety of sizes, shapes, and temperatures colors to allow for an array of fixtures, which need different bases and other considerations. Whether you're using identical bulbs to replace those that have burned out or you're upgrading to something more efficient or perhaps with a higher CRI, we're here to guide you through the decision process with bulbs, fixtures, and lighting. Or calls for a certain filament to get just right the glow? Bulb Size Reference Guide. How to use the chart: The code number of a bulb consists of a letter or letters followed by a number. The letter indicates the shape of the bulb and the number relates to the diameter of the bulb in eighths of an inch.
What most people visualize when the "light bulb" goes off in their head and probably the most common type of residential light bulb is the "A" shape. Common sizes of the A bulb are A15, A19, and A The number designation in the code is usually the width of the bulb at its widest point designated in eighths of an inch. So an A19 is an A shape bulb and is 2. This code designation applies to almost all types of residential lighting, where the letters stand for the bulb shape and the number is the diameter at the widest point. An exception to this is the twisted compact fluorescent bulb CFL that doesn't have a common designation code.