How to choose lumens for optimal lighting?

Lumens are a unit of measurement that determines the luminous flux emitted by a light source. This unit is used to assess the light output of a lighting fixture, unlike watts, which measure electrical consumption. Choosing the right number of lumens is essential for obtaining lighting suited to your needs, whether for a ceiling light, a spot, a wall light, or a floodlight.

By correctly adjusting the lumens, you can create the desired ambiance, taking into account the color temperature, the room's use, and the ambient light. In this article, we will see how to choose lighting based on the number of lumens needed for each space, integrating practical advice and useful considerations.

Choosing the right number of lumens for each room

Lumens needed for main rooms

To light a room such as a living room or bedroom, it is important to consider the surface area in square meters and the ambient light you desire. For example, for a medium-sized living room, general lighting with about 200 to 300 lumens per square meter is recommended.

This luminous flux provides convivial lighting without being too intense. In the bedroom, softer lighting is preferable, about 150 to 200 lumens per square meter, which helps create a calm luminous atmosphere. In contrast, in the kitchen, where more intense lighting is needed, aim for between 300 and 400 lumens per square meter.

Lumens for workspaces

For a workspace such as a home office or a bathroom, suitable lighting must ensure sufficient visible light to avoid eye strain. For these spaces, it is recommended to choose white or cool white light, with a higher number of lumens, from 400 to 500 per square meter.

This level of brightness ensures optimal light output for tasks requiring high concentration. For a bathroom, functional lighting with about 300 lumens per square meter is ideal.

How to measure the lumens needed for your space?

Calculating lumens per m²

To precisely determine the number of lumens you need, simply multiply the room's surface area in square meters by the recommended number of lumens per square meter. For example, for a 20 m² room, you will need to multiply this area by the recommended number of lumens depending on its use.

For a living room, if the standard is 250 lumens per square meter, you will get a total of 5000 lumens for the entire room. This calculation will allow you to choose the necessary light output based on the space to be lit. This complete guide will help you correctly measure the lumens for each room in your house.

Considering the color of the light

Color temperature plays an important role in the perception of a light's brightness. Cool light, which corresponds to a color temperature above 4000K, gives an impression of clarity and is often used in workspaces.

Warm light, below 3000K, is ideal for living rooms and bedrooms as it creates a more intimate and relaxing atmosphere. The lumens of a warm light lamp may seem less powerful than those of a cool light, even if they have the same lumen value. This phenomenon is due to how daylight is perceived by the human eye.

Equivalence between watts and lumens: What you need to know

From power to brightness

When choosing lighting, it is common to compare the electrical power in watts with the number of lumens produced. A 10-watt LED luminaire, for example, can produce about 800 lumens, which is equivalent to a 60-watt incandescent bulb. This shows that LED lighting allows for the same light output with low consumption.

It is therefore important to understand this correspondence between watts and lumens to make informed choices. Indeed, a low-power LED spot will consume less energy while offering the same brightness as a halogen or incandescent bulb.

Pitfalls to avoid

When choosing your lighting, it is essential not to rely solely on the light output expressed in watts. Electrical consumption does not necessarily reflect light intensity. For example, an incandescent bulb will consume a lot of energy to produce few lumens, while an LED bulb will consume less energy while providing more powerful lighting.

Furthermore, it is crucial to properly check the ingress protection (IP) rating of luminaires, especially for outdoor lighting or wet areas like bathrooms. This ensures protection against elements like water or dust, which is essential for the durability of your product.

Other criteria to consider for effective lighting

The role of lux and lumens

Lux and lumens are two different but related units. While lumens measure the total amount of light emitted by a light fixture, lux measures the light intensity received by a specific surface. For example, if you want to light a reading nook, it is recommended to reach 300 lux for comfortable brightness.

Flux can also be used to determine the amount of light needed for different areas of your home, depending on the use. Lighting for a home office, for example, should reach about 500 lux to ensure good visibility and optimal concentration.

Additional features to consider

In addition to the number of lumens, it is important to consider other characteristics of the luminaire, such as the solid angle of the light beam. A spot with a narrow angle will be more suitable for highlighting an object or an entrance, while lighting with a wider angle will be better for general room lighting.

Moreover, the installation of your luminaires must be carried out according to standards to guarantee optimal light output. Professional installation may be required for certain types of luminaires, particularly ceiling lights and wall lights, to ensure uniform light distribution and avoid electrical problems.

Practical tips for choosing your lumens well

The choice of the number of lumens for lighting mainly depends on the size of the room and its intended use. For rooms like the living room or bedroom, soft lighting with 200 to 300 lumens per square meter is ideal. For workspaces such as an office or kitchen, opt for more powerful lighting, between 300 and 400 lumens per square meter.

Remember that color temperature and ingress protection are key elements to consider for suitable and durable lighting. By following these tips, you will be able to create functional, pleasant, and energy-efficient lighting.