Would you like to know how many lumens and lux you need per room ?? Good lighting is essential for atmosphere, functionality, and energy efficiency. Whether in the kitchen, living room, office, or warehouse, the right light intensity ensures comfort and efficient work. In this blog, we clearly explain how many lumens and lux you need per room, what to look out for, and provide helpful calculation tips.
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What you should know in advance: lumens, lux, and light color
The number of lumens indicates the luminous flux of a lamp or light source. It determines how bright or subdued the light appears in a room. The lux value also plays an important role. Lux stands for the light intensity per square meter and is calculated by dividing the lumens by the area. Or vice versa: square meters × desired lux = required lumens. This makes it easy to determine how much lighting you need for a specific room.
Another important aspect is the light color (Kelvin value). It strongly influences how bright the light is perceived. Warm light colors (2200 – 3000 K) create a cozy atmosphere, but appear less bright than neutral or colder light colors (4000 – 6000 K), even with the same number of lumens. Therefore, it is important to pay attention not only to lumens and lux, but also to the appropriate light color for the specific room usage.
The optimal combination of lumens, lux, and color temperature ensures pleasant, efficient, and balanced lighting. In this blog, we will explain step by step how many lumens and lux you need per room, which factors are important, and how you can easily perform the correct calculations.
This way, you always choose the perfect lighting for every application, whether for your kitchen, living room, office, or industrial hall.
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Number of lumens per room
The required number of lumens and lux per room depends on the function of the room.In areas where good visibility is required, such as the kitchen or bathroom, more light is needed than in the bedroom or living room. Thanks to modern LED lighting, you can easily dim the brightness or control it via an app.
Here you will find a practical 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 adhering to these guidelines and additionally choosing the appropriate light color (Kelvin), you ensure pleasant and functional lighting in every room.
Factors for the right light intensity
When choosing the right lighting, lumen and lux values are not the only deciding factors. Ceiling height, beam angle, and the use of the space also play a major role in determining how much light is actually needed.
Ceiling height
Higher ceilings require lamps with a wider beam angle or a higher light output to distribute the light evenly. As a rule of thumb: 500–700 lumens per m² at a ceiling height of 2.4 meters (approximately 50 lux). For every additional half meter of ceiling height, you should plan for an extra 100–200 lumens per m² to ensure adequate illumination.
Beam angle
The beam angle determines how widely the light is distributed.A wide angle ensures large-scale illumination, while a narrow angle provides targeted light. With a smaller beam angle, more lumens are generally required to achieve the same light intensity.
Specific room characteristics
Not every room requires the same light intensity. Tasks, atmosphere, and usage play a crucial role: a workspace needs more light than a bedroom, and a hallway requires a different type of lighting than a bathroom.
By taking these factors into account, you can precisely calculate how many lumens you need and create an optimal lighting concept for every room.
Impact of the beam angle on lumens and lux
If you double the beam angle, the light intensity decreases because the light is distributed more widely. Therefore, if you want to maintain the same light intensity, you need a higher light output (more lumens).
If you double the beam angle of a lamp, the light is spread over a larger area. As a result, the light intensity (lux) decreases, even if the number of lumens remains the same. To achieve the same brightness with a larger beam angle, you therefore need more lumens.
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Example:
Suppose your hall or room is 6.5 meters high. You will then need a light intensity of 5600 lumens per m².With an LED high bay light delivering 5600 lumens and a 40° beam angle, you can easily achieve this. However, if you opt for a 90° beam angle, you will need approximately 3.5 times as many lumens to maintain the same light intensity.
This equates to roughly 20,000 lumens per fixture. The advantage of a wider beam angle is that you can illuminate a larger area at once with a single lamp.
The illustration 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 away).However, this is not an issue, as strategic placement of the lights and overlapping light cones still ensure sufficient overall light output.
In short
With the right combination of lumens, lux, light color, and beam angle, you ensure optimal lighting in any room, whether in your home, office, or warehouse. Through careful planning and calculation, you not only create the right atmosphere but also a functional and energy-efficient lighting solution.
Would you like more practical tips and inspiration about lighting? Read further in our other blogs and discover how to take your lighting to the next level with LED lighting solutions from MeinLed .
