Nowadays, it is important to pay attention to energy efficiency and replace old incandescent bulbs with LED bulbs. But what is behind the mysterious E on light bulbs? Why should we buy E-shaped light bulbs? In this article, we will explain the meaning of the E on light bulbs and why it is so important to buy E-shaped light bulbs.

What does the E in light bulbs actually stand for?
The E in light bulbs is an international standard that identifies the energy efficiency of household appliances. The E stands for energy efficiency and is used as a quality mark on light bulbs and other energy-efficient products. The E on light bulbs is part of the EU label, which assesses the energy efficiency of household appliances. Since 2021, all light bulbs and other energy-efficient products must carry the E-label. This label indicates how efficient the light bulb is and informs the consumer about how much energy it consumes. The E-label on light bulbs consists of a seven-level color coding system that shows the buyer at a glance the energy efficiency of the light bulb. The higher the class, the higher the energy consumption.
The color coding key is graded as follows:
- A++: The most energy-efficient light bulb.
- A+: Very energy-efficient.
- A: Energy-efficient.
- B: Moderately energy-efficient.
- C: Less energy-efficient.
- D: Low energy efficiency.
- E: Very low energy efficiency.
The E-label is an important tool that helps consumers choose energy-efficient light bulbs. The goal is to help consumers buy the most energy-efficient products to save energy and money. Light bulbs with the E-mark are usually more expensive than conventional light bulbs because they are more energy-efficient. However, these higher costs are offset in the long run by lower energy consumption. A light bulb with an E-mark can consume up to 80 percent less electricity than a conventional light bulb.
For people who value energy efficiency, it is important to know what the E in light bulbs stands for. This labeling helps buyers find the most energy-efficient light bulb for their individual needs. It is an important tool to save energy and money. The E-label is an important part of the EU energy efficiency label and an important tool for buying energy-efficient household appliances. It helps consumers choose the best products to save energy and money. Therefore, it is important to know what the E in light bulbs stands for.

What does E27 mean?
E27 is a term from the lighting industry that refers to the size of the light bulb. It is a standard incandescent lamp size common in Europe. E27 refers to the size of the screw thread that screws into the socket. E27 is the most common size for light bulbs, so it is often referred to as the "standard socket". Our handmade lamps, such as our floor lamps, also have E27 sockets.
The term "E27" refers to the diameter of the socket into which the light bulb thread is screwed. The diameter of the socket is 27 mm, which is why the designation "E27" is used. This is a European standard used in most European countries. Some other parts of the European continent use different sizes for their light bulbs, but E27 is the standard.

E27 light bulbs are available in many different shapes and sizes, such as small candle shapes, standard light bulbs, reflector bulbs, and more. They are also available in a variety of colors, including warm white, cool white, red, green, blue, and yellow. E27 light bulbs are also available in various wattages, including low, medium, and high wattage bulbs. E27 light bulbs are also available in different efficiency classes, including LED, halogen, CFL, and incandescent bulbs.
LED lights are the most efficient type of light bulbs on the market because they have the longest lifespan and consume significantly less energy than other types of light bulbs. CFL bulbs are another efficient option, and halogen bulbs are a more affordable option that has a longer lifespan than regular light bulbs.
E27 sockets are a standard size used in many European countries. They are available in a variety of shapes, sizes, and colors, as well as with different efficiencies. They are a versatile lighting solution that is suitable for many different applications.
Further articles
This article is part of our comprehensive guide to lighting technology. There you will find all important information bundled.