Why ‘more lumens’ does not mean better lighting

When choosing a lamp or luminaire, many people look first at the lumen output. The higher the number, the better the lighting will be, right? In reality, it is not that simple. A solution with more lumens can even create visual discomfort or illuminate a space less effectively if it is not suited to its intended application.

Lumens indicate the amount of light emitted, but not the quality of the lighting experience within a space. Good lighting depends on several factors working together: the size of the room, the function of the space, light distribution, colour temperature and visual comfort.

For this reason, a very powerful luminaire may be excessive in a living room and, at the same time, insufficient if it is poorly positioned in a kitchen.

What Do Lumens Really Measure?

Lumens measure luminous flux, which is the total amount of visible light emitted by a source. In simple terms, the higher the lumen output, the more light a lamp produces.

The problem is that “more light” does not necessarily mean “better light”. If the light is too intense, it can cause glare, discomfort and even make a space feel less inviting. The final result depends not only on the quantity of light, but also on how that light is distributed within the environment.

This is precisely why lighting professionals do not evaluate lighting based on lumens alone. In many cases, what matters most is the amount of light that actually reaches surfaces and people, which is measured in lux.

What About Watts?

For many years, people became accustomed to choosing lamps based on wattage. A 100 W lamp was considered more “powerful” than a 60 W lamp because it consumed more energy and, with older technologies, this generally also meant more light.

Today, that relationship is no longer valid.

Watts only indicate electrical power consumption, not the amount of light produced. Thanks to advances in LED technology, it is now possible to achieve significantly more light while consuming far less energy.

For example, a 10 W LED lamp can produce a similar amount of light to a 60 W incandescent lamp. For this reason, when comparing lighting solutions, it is more important to look at lumens than watts.

Even so, lumens do not tell the whole story. Two luminaires with the same luminous flux can deliver very different results depending on the optics, light distribution and the way they are applied within a space.

The Difference Between Quantity and Quality

This is where many people get it wrong. A lamp with a high lumen output may seem like a good choice, but if the light is poorly distributed or has an unsuitable colour tone, the overall lighting quality can be worse than that of a less powerful alternative.

For example, in a bedroom, very bright and cool light can reduce comfort and create an unpleasant atmosphere. In a kitchen work area, on the other hand, sufficient light is essential to ensure visibility and safety. The goal is not to choose the most powerful solution, but rather the most appropriate one for the intended application.

What Should Be Considered?

When choosing lighting, it is worth considering:

• Lumens, to understand the amount of light produced.
• Lux, to evaluate the amount of light reaching a specific area.
• Colour temperature, to determine whether the light appears warmer or cooler.
• Beam angle, to understand whether the light is more focused or more widely distributed.
• Energy efficiency, to achieve good performance with lower energy consumption.

Together, these factors provide a much more accurate picture of the performance of a lamp or luminaire.

Together, these factors provide a much more realistic understanding of the performance of a lamp or luminaire.

A Practical Example

Imagine two lamps with the same lumen output. One distributes light evenly throughout the room, while the other concentrates most of the light in a single spot.

Although both produce the same amount of luminous flux, the lighting experience will be completely different. One may provide visual comfort and balanced illumination, while the other may create overly bright areas and unwanted shadows.

This is why lighting should be considered as a complete system, rather than simply a matter of counting lumens.

Conclusion

“More lumens” means more light, but not necessarily better lighting. The right choice depends on the space, its intended function and the way light is distributed.

When the focus is placed solely on quantity, there is a risk of overlooking what truly makes a difference: visual comfort, energy efficiency and suitability for the environment.

In lighting, the goal is not to have more light, but the right light. A well-designed lighting solution enhances visual comfort, highlights architecture and responds to the real needs of each project.