What is a Mogul E39 base?

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Lighting isn’t just about illumination; it’s a combination of technology, design, and functionality. While most of us don’t delve into the technical aspects of our bulbs and holders, understanding some basics can go a long way, especially when you’re looking to replace or buy new fixtures.

A Mogul E39 base, to put it simply, is a specific type of screw-in base for light bulbs, characterized by its larger diameter and widespread use in commercial and industrial settings. The name might not ring a bell immediately, but if you’ve ever been in a warehouse or large commercial space, you’ve likely seen these bases in action.

Being in the industry, especially at James Lighting, has given me firsthand experience with these bases, and I’d love to share this knowledge with you.

E39 E40 Mogul Edison Screw Ceramic Lamp Holder Socket With Mounting Bracket Dimensions

What’s the origin of the ‘E39’ designation?

You might wonder where the term ‘E39’ originates from. Well, it’s a combination of technical and nomenclinal designation.

The ‘E’ in E39 stands for ‘Edison,’ named after the legendary inventor Thomas Edison. The number ’39’ refers to the base’s diameter, which is 39 millimeters. This specific sizing is what sets the Mogul E39 apart from other bases, ensuring that bulbs fit seamlessly into their respective fixtures.

Why opt for a Mogul E39 base?

So, what makes the Mogul E39 base a popular choice among industrial and commercial sectors?

Firstly, the base’s larger diameter enables it to support high-wattage bulbs, particularly those used in vast spaces requiring intense lighting. Its design is tailored to cater to settings like stadiums, warehouses, and streetlights, where standard bases just won’t cut it.

E39 4KV porcelain light socket ceramic lamp holder UL

How does it compare to the E26 base?

Many are familiar with the E26 base, commonly referred to as the ‘medium’ base. So, how does it stack up against the Mogul E39?

In essence, while both bases have their specific applications, the Mogul E39 is larger and more robust, designed to handle high-intensity discharge (HID) bulbs. On the other hand, the E26, with its 26mm diameter, is more suited for regular household use.

Are there any compatibility issues to be aware of?

Being in the manufacturing sector, particularly at James Lighting, I often encounter questions about compatibility.

While the Mogul E39 base is standardized, it’s always essential to ensure that the chosen bulb aligns with the fixture’s specifications. This not only guarantees optimal performance but also ensures safety, given that these bulbs often operate at high wattages.

E39 to E26 Medium ceramic base lamp holder sockets reducer

What about adaptors for the Mogul E39 base?

Adaptors can be a game-changer, allowing users to fit different bulbs into various bases. But is there one for the Mogul E39?

Yes, adaptors do exist to transition from a Mogul E39 base to an E26 or other bases. This flexibility can be useful in specific scenarios, but as always, it’s crucial to ensure the adapter doesn’t compromise the fixture’s integrity or safety.

Can the Mogul E39 base be used outdoors?

Given its design and applications, many wonder if the Mogul E39 base is suitable for outdoor use.

While primarily designed for indoor commercial spaces, several outdoor fixtures, especially streetlights, utilize the Mogul E39 base. However, always ensure the bulb and holder are rated for outdoor use, considering factors like weather resistance and longevity.

E39 F547A-7 porcelain lamp holder

How does the Mogul E39 contribute to energy efficiency?

With the growing emphasis on sustainability, how does the Mogul E39 base fit into the picture?

Bulbs designed for the Mogul E39, particularly LEDs, are known for their energy efficiency. They offer powerful illumination while consuming less energy, translating to reduced energy bills and a smaller carbon footprint.

E39 F547-8 porcelain lamp holder


The Mogul E39 base, with its distinctive size and design, plays an indispensable role in the world of commercial and industrial lighting. Knowledge about such components, while might seem trivial, can empower users to make informed decisions. At James Lighting, we pride ourselves on delivering products that not only meet industry standards but also exceed client expectations.

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