How Many Lumens In Bedroom
If you are planning to completely redecorate your interior or renovate your home, don't forget one element that will actively participate in the final result: light. But it's not just a matter of choosing beautiful interior lighting fixtures, although these elements are important. This article focuses on a subject that you may not have had time to look into, namely light intensity, which is expressed in quantity of Lumens. How do you know the amount of lumens needed per square meter (m²) to obtain optimal luminosity depending on the room in your home?
Practical glossary
This lexicon contains terms that you will undoubtedly come across when buying your bulbs and light fixtures.
Lumens: the luminous flux, also called "luminosity" or "luminous efficiency", expresses the total amount of visible light emitted by a light source per unit of time, calculated on the sensitivity of the human eye to the wavelengths of light. For example, the absolute power of a traditional incandescent light bulb is 100 watts, or about 1,500 to 1,700 lumens.
Watts: This is the unit of measurement for the amount of electricity consumed by a light bulb to reach its intended brightness. Each light source, whether LED , fluorescent, halogen or incandescent, has a different lumen-per-watt ratio.
Power equivalence: how many watts are 1500 lumens? The power equivalence is 100 watts in the case of an incandescent bulb! A 10 watt LED bulb will provide the equivalent of 100 watts if it is an incandescent bulb.
Lux: This unit expresses the total amount of lumens in the room divided by the number of m² of said room.
Kelvin: this other unit of measurement expresses the hue of light delivered by a luminaire. For example, the color temperature of a luminaire ranges from approximately 1,800 K for a candle to approximately 10,000 K for an electric arc; direct solar radiation at a color temperature of approximately 5,500 K.
Watt-Lumens power equivalence
| Incandescent Bulbs | LED Light Bulbs | Lumens |
| 20W | 3W | 250 |
| 25W | 4W | 330 |
| 40W | 8W | 450 |
| 60W | 13W | 800 |
| 75W | 17W | 1100 |
| 100W | 20W | 1500 |
| 150W | 25W | 2000 |
The essential criteria for calculating the quantity of lumens required per m² are as follows
Every room has its own brightness!
We are not going to light the bathroom in the same way as the living room or the kitchen! The following table will put you on the right track:
| Room of the dwelling | Ideal type of environment | Recommended number of lux | Color temperature |
| Dining room, living room, adult bedroom | Intimate - Restful | 25-50 | 2700 to 3500 Kelvins - Warm White |
| Adult bedroom, office, dining room, living room | Welcoming - Warm - Relaxing | 100-150 | 2700 to 3500 Kelvins - Warm White |
| Kitchen, playroom, children's bedroom, office, reading corner | Focus | 200-250 | 3500 - 5500 Kelvins - Neutral White |
| Professional office, children's room, reading corner, kitchen | Focus | 350-500 | 5500 to 8000 Kelvins - Cool White |
| Outdoor spaces | 80-100 |
To each luminaire its brightness!
Not all types of lamps deliver the same brightness. Whether you opt for recessed spotlights, ceiling lights, floor lamps, outdoor lights , the result will of course be different. For your convenience, we have taken care to detail each product offered on our online store. Simply consult the category "Power", expressed in Watts!
The right color temperature
The color temperature. The warmer the color temperature, the lower the light intensity will be and the colder the color temperature, the stronger the light intensity will be. You can indeed choose between warm, normal or cold light. Here again, there is a specific unit of measurement, the Kelvin. Concretely :
- For a warm luminosity, between 2700 and 3000 Kelvin will be needed;
- For normal brightness, between 4000 and 4500 Kelvin will be required;
- For a cold luminosity, between 6000 and 6500 Kelvin will be needed.
Suspended luminaires
Ceiling height for suspended luminaires. Professionals recommend, as far as possible, that you suspend your light fixtures from 2.5 to 2.7 m from the floor. The quantity of light generated at 1 m from the light source with 1 candela is expressed in Lux.
The light beam
The light beam, which :
- The wider it is, the more light it will diffuse (less than 15°);
- The narrower it is (from 15° to 24°), the more the lighting will be accentuated.
The reflection factor
Rather technical criterion, it is the ability of a paint color and a type of material to reflect light. Its result expresses the light output.
The mathematical formula to calculate the number of lumens needed per m².
If you wish to calculate the number of lumens needed per m², here is the mathematical formula to be applied for the interior of your home:
- Room area x number of lux x (1/light output) x (1/reflection factor)
How many fixtures are needed to achieve optimum brightness?
If you wish to go to the simplest and calculate instead the ideal number of luminaires for a room, simply divide the recommended emitted light intensity above in our table with the number of lux indicated on the description of your light source.
Example with an adult bedroom :
100 lux recommended / 40 lux produced by one LED light bulb = 2.50 (lights needed to properly illuminate the room)
Good to know
The color of the walls and furniture. If they are rather dark or if you use a light source equipped with lampshades, you will need about 10 extra lumens per square meter.
To create a particularly bright room, add another 10 to 20% to the number of lumens you get!
Think about installing dimmers for a luminosity according to your needs, desires, moods ...
Source: https://www.cote-lumiere.com/e-shop/en/blog/how-to-determine-the-necessary-quantity-of-lumens-per-m2-for-optimal-lighting-n33
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