Want to know how many lumen and lux you need per room? Good lighting is essential for atmosphere, functionality, and energy efficiency. Whether it's your kitchen, living room, office, or warehouse: the right light intensity ensures comfort and efficient work. In this blog, we clearly explain how many lumen and lux you need per room, what to look out for, and provide handy calculation tips.
Table of contents
What you need to know in advance: lumen, lux, and light color.
The amount of lumens indicates the light output of a lamp or light source. This determines how bright or subdued the light in a room will be. In addition, the amount of lux also plays an important role. Lux represents the luminous intensity per square meter and is calculated by dividing the number of lumens by the surface area. Or vice versa: number of m² x desired lux = required number of lumens. This allows you to easily determine how much lighting you need for any specific space.
Another important aspect is the light color (Kelvin value). This has a major influence on how bright the light is perceived to be. Warm light colors (2200 – 3000K) create a cozy atmosphere, but appear less bright than neutral or colder light colors (4000 – 6000K), even with the same number of lumens. It is therefore essential not only to look at lumens and lux, but also at the correct light color for the function of the room.
The optimal number of lumens, lux, and the right color temperature together ensure comfortable, efficient, and well-balanced lighting. In this blog, we explain step by step how many lumens and lux you need per room, which factors are important, and how you can easily make the right calculations.
This way, you always choose the perfect lighting for every application, whether it concerns your kitchen, living room, office, or commercial hall.
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Number of lumens per room
The required lumens and lux per room depend on the function of the room.In spaces where good visibility is needed, such as the kitchen or bathroom, more light is required than in a bedroom or living room. Thanks to modern LED lighting, you can easily adjust the light intensity by dimming or controlling it via an app.
Below is a handy overview of the recommended light intensities per room:
- Kitchen – approx. 50 lux/500 lumens per m²
- Dining room – approx. 40 lux/400 lumens per m²
- Office – approx. 60 lux/600 lumens per m²
- Bedroom – approx. 30 lux/300 lumens per m²
- Bathroom – approx. 40 lux/400 lumens per m²
- Hallway – approx. 30 lux/300 lumens per m²
- Living room – approx. 15 lux/200 lumens per m²
By working with these guidelines and also choosing the right light color (Kelvin), you ensure pleasant and functional lighting in every room.
Factors for the right light intensity
When choosing the right lighting, not only the number of lumens and lux is important. Ceiling height, beam angle, and the function of the room also play a major role in how much light you actually need.
Ceiling height
With higher ceilings, you need lamps with a wider beam angle or a higher light output to distribute the light properly. As a rule of thumb: 500–700 lumens per m² at a ceiling height of 2.4 meters (±50 lux). For every additional half meter of ceiling height, you can add about 100–200 extra lumens per m² for sufficient lighting.Beam angle
The beam angle determines how widely the light is distributed. A wide angle provides more coverage, while a narrow angle provides focused light.With a narrower beam angle, you often need more lumens to achieve the same light intensity.
3. Specific characteristics of the room
Not every room requires the same light intensity. Consider tasks, ambiance, and use: a workspace needs more light than a bedroom, and a hallway requires different lighting than a bathroom.
By taking these factors into account, you can precisely calculate how many lumens you need and ensure an optimal lighting plan for every room.
Effect of the beam angle on lumens and lux
When you double the beam angle, the light intensity will decrease because the light is distributed over a wider area. If you want to maintain the same light intensity, you will therefore need a higher light output (lumens).
When you double a lamp's beam angle, the light is spread over a larger surface area. As a result, the light intensity (lux) decreases, even though the number of lumens remains the same. To maintain the same brightness with a wider beam angle, you therefore need more lumens.
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Example:
Suppose your hallway or room is 6.5 meters high. In that case, you need a light intensity of 5600 lumens per m². You can easily achieve this with a 5600 lumen LED High Bay and a beam angle of 40°.However, if you choose a beam angle of 90°, you will need about 3.5 times as many lumens to maintain the same light intensity.
That comes down to about 20,000 lumens per fixture. The advantage of a wider angle is that you can illuminate a larger surface area at once.
The image shows how the light intensity decreases as the beam angle increases: 257 lux is measured directly beneath the lamp, while only 128 lux remains at the sides (6.5 meters further away). This is not an issue, because by positioning the lamps strategically and overlapping their light beams, you will still achieve sufficient total light output.
In short
With the right combination of lumens, lux, light color, and beam angle, you ensure optimal lighting in any space, whether it's your home, office, or industrial building. By carefully calculating and planning, you not only create the right atmosphere, but also a functional and energy-efficient lighting solution.
Would you like more helpful tips and inspiration about lighting? Check out our other blogs below and discover how to take your lighting to the next level with LED lighting from LedLoket.
