An Easy Guide For Light Bulb Base Size-E17 LED BULB

Have you ever found yourself buying a light bulb base that doesn't work? It's easy to see which bulbs need replacing and buy one with a similar base, but how do you know if the bases are the same? For example, many different light bulbs have the same shape and may have similar bases, but very different sizes.

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What's the difference between the bulb bases?

There are a wide variety of types of bulb mounts, the most common of which is the Edison screw mount, which can be found on most incandescent bulbs as well as on halogen, compact fluorescent, HID, and now widely available LED lights.

When choosing a lamp, you may also see a lot of bases starting with E, such as E26/E12/E39/E17 LED bulb and so on. In fact, they all come from Edison screw bases. The letter E stands for Edison, and the number behind is used to indicate the diameter, in millimeters (mm).

Here are some of the most common Edison base names and information about them:

E12 (12mm diameter), also known as the "Mini Edison Screw MES" base, is used for night light bulbs and decorative bulbs for pendant lamps and bathroom mirrors.

Examples include pendant lights, wall lights, Christmas lights, dining room pendant lights, decorative lights, residential or commercial string lights and night lights. Many bulbs with these bases are designed to mimic the look of a candle flame.

Common bulbs for E12 bases:

Small tube bulbs: T8, T6, T22
Candle flame bulbs: C7, C9, CA10, B10
Spherical bulbs: G14, G16, G50

E17 (diameter 17mm), commonly used in table lamps and electrical bulbs, is not a very commonly used type. E17 LED bulb are commonly used in appliance lights such as microwave oven lights, refrigerator lights, and range hood lights. They are also present in ceiling fan fixtures.

Regular bulb with E17 LED bulb base:

Type A bulb: A15
Small tube bulbs: T8, T6, T22
Candle flame bulbs: C7, C9, CA10, B10
Spherical bulbs: G14, G16, G50
Marquee and Logo Bulb: S11

E26 (26mm diameter), is the size of most bulbs used in the United States. They are typically used for general lighting in standard fixtures such as ceiling lights, lamps, can lights, outdoor spot and flood lights, and vanity lamps.

Regular bulb with E26 base:

Type A bulb: A19, A15, A21
Ball bulb: G30, G25, G16.5
PAR (Parabolic Aluminium Reflector) spotlights and floodlights: PAR16, PAR20, PAR30, PAR38
BR (Bulging Reflector) spotlights and floodlights: BR20, BR30, BR40

E39 (diameter 39mm), is commonly used in street lamps and high-power lamps.

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An Easy Guide For Light Bulb Base Size-E17 LED BULB

What's the difference between the bulb bases?

Here are some of the most common Edison base names and information about them: