What Does Lumen Mean?

The unit of Lumen, which expresses the brightness and the intensity of light distribution, is especially used for energy-saving lighting systems such as LEDs. The higher the lumen value, the higher the brightness of the light. Although lumen is often confused with watt—the unit showing the amount of energy consumed—they are actually different concepts. So, what does lumen mean and how is it calculated? Let’s take a closer look together.

What Is Lumen and What Is It Used For?

Lumen is a unit of luminous flux that measures the amount of light emitted by a light source and is expressed with the symbol “lm.” Also referred to as the amount of light perceived by the human eye, this concept was developed by English physicist and mathematician Thomas Young and Scottish physicist James Clerk Maxwell. With the introduction of LED lights, lumen has become more commonly used. It is employed to measure the total light output of a light source and is directly proportional to the intensity of the light. As brightness increases, the lumen value also increases.

How Is Lumen Calculated?

Lumen is an important concept for ensuring proper lighting of both indoor and outdoor spaces. For example, an incorrect calculation for outdoor spaces may result in LED bulbs performing below the desired level. The first factor to consider when calculating lumens is the square meter of the space where lighting will be used. For homes, an average of 300 lumens per square meter is sufficient, whereas offices, which require brighter environments, need an average of 400 lumens per square meter. The formula to calculate how many lumens are needed for a given space is:

Area in square meters × Required lumens per square meter

For instance, when applied to a 50-square-meter living room, the formula 50 × 300 indicates that a lighting source of 15,000 lumens is needed

What Is the Difference Between Lumen and Watt?

In order to keep energy consumption under control, it is necessary to turn to lighting options with measurable wattage. However, when a brighter environment is required, lumen values should be considered. Knowing the differences between lumen and watt enables you to make more informed choices as a consumer. The key differences are as follows:

● Watt indicates the amount of energy consumed, whereas lumen refers to the brightness emitted by a bulb and how much it illuminates a space.

● It is difficult to predict how much light a source will provide just by looking at its wattage. For example, watt alone may not determine whether a bulb will sufficiently illuminate a 30-square-meter space. However, lumen calculations make this possible.


The approximate lumen output of incandescent, halogen, and fluorescent bulbs by wattage is shown below:

Incandescent Bulb	Halogen Bulb	Fluorescent Bulb	Lumens
15 W	18 W	3 W	110 - 170 - 100
40 W	42 W	7 W	420 - 630 - 400
60 W	53 W	9 W	710 - 840 - 480
75 W	70 W	11 W	940 - 1200 - 660
100 W	105 W	13 W	1360 - 1900 - 780

If your goal is to reduce your bill, focus on wattage. But if you want the best possible illumination, pay attention to lumen values. With advancing technologies, the increasing variety of economical and efficient lighting options has made lumen calculation more important.

Choosing Lumen Values for Different Spaces

The recommended lumen value for different areas may vary depending on specific needs and personal preferences. Average lumen values for various spaces include:

● 1,500–3,000 lumens for living rooms and bedrooms in homes.

● 4,000–6,000 lumens for kitchens and bathrooms.

● 3,000–6,000 lumens for offices and workshops.

● 1,000–2,000 lumens for outdoor areas like verandas or gardens.


It is important to remember that the recommended lumen value can vary based on factors such as room size, layout, type of lighting fixtures, and personal preferences. Accurate lumen calculations are crucial to achieving the desired lighting performance.

Other Uses of Lumen

Lumen is not only used in lighting systems. For example, lumen foil, which is also used as an advertising material, can release the light it has absorbed from the sun or artificial light sources for about half an hour, for 4 to 10 hours in dark environments. The brightness of flashlights is also measured in lumens. While an average of 300 lumens may be sufficient for short-term use, flashlights with lumen values exceeding 1000 are preferred in large-scale applications such as search and rescue operations.

Advantages of High-Lumen Lighting

The lumen value is directly proportional to brightness. In smaller spaces, high-lumen lighting can sometimes cause issues. However, in large areas requiring stronger illumination, high-lumen lighting offers significant advantages, including:

● Better Visibility: Bright, high-lumen lights illuminate large areas clearly, making details easier to see.

● Energy Efficiency: Energy-saving lights like LEDs provide optimal brightness with lower energy consumption.

● Fewer Fixtures Needed: High-lumen lighting can cover wider spaces, reducing the number of bulbs or fixtures required.

Lumen and Energy Efficiency

Lumen is also closely related to energy efficiency. By calculating lumens, it is possible to ensure efficient lighting, save energy, and contribute to sustainability. In fact, calculating lumens and using energy-efficient lighting systems can be seen as one of the keys to a brighter future.

If you are looking for lighting systems with different lumen values for your home or workplace, you can easily find what you need in Günsan Elektrik’s wide product range. Once you’ve added your chosen product to your cart, you can purchase it with Günsan’s assurance or contact us for more detailed information.