which led bulbs to choose?

The right light source

Are you looking for practical lighting for your apartment, home or office? Have doubts about your choice of bulbs and how they fit into your lamps? Read the description of the most popular types of threads to find the perfect solution for you.

Thread e27 e14

An E27 or E14 threaded bulb is a bulb that has a specific type of thread. They are named after the creator of this standard specification, Thomas Edison, and “27” or “14” refers to the thread diameter in millimeters.

These threads are a type of screw connection that are widely used in lighting. They look like spirals running around the base of the bulb, and their functions are to provide a safe and secure connection to the light fixture. These are standard thread types in many countries, especially in Europe.

These threads are widely used in various types of lighting, such as table lamps, floor lamps, ceiling lamps, wall lamps and spotlights. Note that not all bulbs are compatible with every fixture. Before buying a bulb, it’s always a good idea to check what type of thread is required by the fixture.

thread gX5.3

GX5.3 thread is a specific type of light source that is popular among manufacturers of different types of lamps. This bulb features a narrow angle of light dispersion, intense light and a low price.

GX5.3 bulbs are available in LED and halogen variants. The GX5.3 threaded bulb shares many features with other halogen fixtures. The top of the bulb is in the form of a hemisphere with a flattened top (or gently convex). As for the bottom part, the actual GX5.3 thread, it consists of short, slender “legs.” The dimensions of the top of the GX5.3 bulb may vary while the spacing of the “feet”, which defines the size of the GX5.3 thread, is 5.3 millimeters. The height of this bulb is about 48-50 millimeters, and the diameter of the main part oscillates between 40 and 50 millimeters.

thread g13

An incandescent bulb with a G13 thread is a specific type of light source, most commonly found among fluorescent lamps, commonly known as fluorescent lamps. In the case of the G13 thread, we are not dealing with a classic screw thread such as E27 or E14. Instead, G13 is a type of connector in which there are two metal pins at each end of the fluorescent lamp, which plug into the corresponding sockets in the lamp socket. The term “G13” indicates the type of connector (“G” – bi-pin), and “13” indicates the spacing between pins, which is 13 millimeters.

thread gu10 g9

A GU10 or G9 threaded bulb is a type of bulb that has a specific type of connection. Unlike E27 or E14 type threads, GU10 is not a screw thread, but a snap-lock system.

In a GU10 or G9 bulb, there are two metal pins on the base of the bulb, which are placed at equal distances from each other. These pins are used to plug the bulb into the fixture by rotating it. In this arrangement, “GU” or “G” indicates the type of connection, and “10” or “9” indicates the distance between pins in millimeters.

GU10 and G9 threads are typical connectors used in halogen bulbs and some types of LED bulbs. They are mainly used in spot lighting, such as ceiling spotlights, track lighting and accent lighting. These are places where strong, directed light is required.

Thread g4

The G4 bulb is a specific type of light source, similar to the G9 model, which is designed to operate on a reduced voltage of 12V. Although all G4 bulbs originally operated only on low voltage, there are now models designed to handle 230V.

The G4 bulb is a small, low-power light source that can be useful as accent or supplemental lighting. These bulbs, which are available in traditional and LED versions, are usually used in furniture, desk and ceiling lamps. They are valued for their wide range of light dispersion, emitting white cool or warm light, and their versatility.

We can switch from traditional lighting to a G4 LED bulb, which provides safe voltage and long-lasting performance.

The G4 thread is characterized by specific features, the most prominent of which are the straight, slender “legs.” Light bulbs with a G4 thread can have a variety of forms, among which the most popular are round (resembling a small plate), oval and cylindrical shapes. The lower part – the actual thread – is installed by pressing.

The different shapes of G4 bulbs allow their versatile use in both the furniture and construction industries. The varied forms of LED G4 bulbs make them an excellent alternative to traditional halogen lighting. The small size of G4 bulbs increases their range of potential use.

The foot spacing of the G4 bulb stem is 4 millimeters, while the rest of its dimensions may vary depending on the purpose, manufacturer and, of course, shape. Unlike typical incandescent bulbs, G4 bulbs are subtle and small, allowing them to fit into even the tiniest lamps.

Different types of LED bulb shapes


A-series bulbs have classic shape, which most people associate with a light bulb. They are usually known as standard or GLS (General Lamp Service).

These bulbs are commonly available with both bayonet (e.g., B22) and threaded (e.g., E27) caps and have a wide range of applications. They are most often used in homes: in ceiling lamps, kitchen lamps, table lamps or floor lamps.


C-series shaped bulbs (referring to Candle or to Conical) are all bulbs that mimic the shape of a candle flame. They are smaller than most other bulb series. Each bulb has a slightly different shape – CA most resembles a candle flame with a slightly curved tip, followed by C and B, which look more blunt and stylized.

They are commonly used in chandeliers, artificial candles, nightlights or decorative lighting like Christmas lights. The values given with a given shape type, e.g. C37, indicate the largest diameter given in millimeters.


Reflector bulbs (R) or bulb bulbs (BR) are sometimes used interchangeably and may be internally lined with reflective material that helps emit light from the bulb to achieve a wide beam angle. They can have a flat (R) or bulged (BR) surface made of colored, frosted, clear or patterned glass or plastic, which helps diffuse and distribute light more evenly.

Typically, LED headlight bulbs are not covered with reflective material. This is because LEDs are highly directional and the entire light source can be directed outward, rather than requiring a reflective surface from which it can bounce.

The R Series (Reflector) and BR Series (Bulged Reflector) bulbs provide a very wide beam angle, making them ideal for use in a variety of both commercial and residential settings. They are most often used in track lighting, in lighting where recessed lighting is used or in display lighting. The value in the R50 designation indicates the diameter given in millimeters.


The bulbs in the G series, referring to Globe, are spherical bulbs available in different sizes. There are small bulbs the size of a golf ball, suitable for small, enclosed fixtures, all the way up to very large spheres usually intended for display. The larger G-series bulbs are usually equipped with carbon or LED filaments, giving them an aesthetically pleasing appearance. The wide range of sizes makes it easy to fit a variety of frames. The value in the designation, for example. G45 means the diameter given in millimeters.


T-series tubular bulbs are available in a variety of sizes and shapes, from the familiar fluorescent tubes to the aesthetically pleasing tube-like shapes commonly associated with incandescent bulbs. The variety of sizes and stem types (such as E27, E12, G5 or G13) makes them suitable for a wide range of applications such as chandeliers, wall lamps, pendant lamps, warehouse lighting or garage lighting.

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