When choosing a lamp for your home or office, you may come across terms like lumens, watts, and lux . But what are they and what is the difference?
- Lumen (lm) : Indicates the total amount of light emitted by a light source. The higher the number of lumens, the more intense the light will be.
- Watts (W) : Measures the energy consumption of the lamp. With the advent of LED technology, watts are no longer a direct indicator of brightness.
- Lux (lx) : Indicates the intensity of light on a surface. One lux is equivalent to one lumen distributed over one square meter.
How many lumens are needed to illuminate a room?
The amount of lumens needed depends on the environment, the function of the lighting and the size of the room.
To calculate the number of lumens you need, you can follow this approximate formula:
Required Lumens = Recommended Lux × Room Surface (m²)
Environment | Media Lux | Ideal range |
Stay | 250 lux | 150 - 300 lux |
Bedroom | 150 lux | 100 - 200 lux |
Kitchen | 300 lux | 250 - 400 lux |
Bath | 300 lux | 200 - 400 lux |
Study | 400 lux | 300 - 500 lux |
External | 100 lux | 50 - 200 lux |
These values can vary depending on the type of lighting (general, accent or functional) and personal preferences.
For example, in a 35 m² living room like the one in the following photo, considering a recommended illumination of 200 lux, the total lighting requirement will be 7,000 lumens (200 lux × 35 m²).
Conclusion
Creating harmonious lighting means finding the right balance between lumens, watts and lux for each room in the house.
Calculating the lumens needed to properly illuminate a room depends on various factors, such as the size and function of the room. The formula is simple: Required lumens = Recommended lux × Room surface area (m²) .
If you are unsure how to apply these calculations or need personalized advice for your space, our Lumiavera experts are ready to advise you. Contact us to discover the ideal solution for you .
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