Understanding E26 and E27 Bulbs: Where the E stand for Edison

Understanding E26 and E27 Bulbs: Where the E stand for Edison
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Choosing the right light bulb can be confusing with so many options available. Ever wondered what the difference is between E26 and E27 bulbs? You're not alone. These two bulb types look almost identical but have key differences that could affect your lighting setup.


In this guide, we will break down the differences between E26 and E27 bulbs, helping you choose the right one for your needs. We'll explore their specifications, electrical safety standards, and practical tips for selecting the perfect bulb for your home or office.


Understanding E26 and E27 Bulbs

What are E26 and E27 Bulbs?

E26 and E27 bulbs are standard screw-in bulb bases widely used in various lighting fixtures. The "E" stands for Edison Screw, named after Thomas Edison, and the number represents the diameter of the base in millimeters. E26 bulbs are commonly used in North America ( USA ), while E27 bulbs are prevalent in UK, Europe, Asia, and Oceania.

  • Think of E26 as the North American standard and E27 as the European counterpart.
  • "Switching to the correct bulb type improved the longevity and safety of my fixtures," says a satisfied customer.

Voltage and Compatibility

Why Voltage Matters

The primary difference between E26 and E27 bulbs is their voltage rating. E26 bulbs are designed for 120V, while E27 bulbs are rated for 240V. Using the wrong bulb can lead to a shorter bulb life. 

  • E26 bulbs for 120V power supply, E27 for 240V.
  • Using an E26 bulb in an E27 socket can lead to a shorter bulb life.

Bulb Types and Applications

Choosing the Right Bulb Type

E26 and E27 bases are available in various types, such as incandescent, LED, CFL, and halogen. Selecting the right type based on your needs can enhance energy efficiency and lighting quality.

  • LEDs are energy-efficient and have a longer lifespan compared to incandescent bulbs.
  • LED bulbs can save up to 80% more energy than traditional incandescent bulbs.

Mechanical and Electrical Differences

The Nitty-Gritty Specifications

Though similar in size, E26 and E27 bulbs have different mechanical and electrical specifications to fit their respective voltage requirements. This section details the dimensions and design differences.

  • E27 bulbs have a 1mm longer screw length and a taller insulator cap.
  • These differences ensure safety and compatibility with higher voltage levels.


Practical Tips for Choosing Bulbs

Making the Right Choice

Selecting the right bulb involves considering voltage, bulb type, brightness, dimmability, and fixture size. This section provides a checklist to help you make an informed decision.

  • Always check the voltage rating before purchasing a bulb.
  • Use our online tool to find the perfect bulb for your fixture at Haus of Interiors.



We've explored the key differences between E26 and E27 bulbs, from their voltage ratings to mechanical specifications and practical applications. Understanding these factors will help you make safe and efficient lighting choices.

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