Recommended lighting power calculation of the number of bulbs

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Recommended lighting power calculation of the number of bulbs




by Christophe » 10/06/11, 11:03

Many people wonder about the recommended lighting power and the number of bulbs needed. The blur and the commercial blablas being legions, here is a summary subject of the sizing of the lighting of a room (values ​​from the subject on lighting of kitchens and bathrooms )

To begin, you must know that the lighting power in Lux is a subjective enough size: Some people will be happy with 80 lux in their living room while others will want 300!

Also the type of light (lighting spectrum) plays a lot: economic and LED bulbs a bulb in natural sunlight will give a much greater light impression while the lumens of the source are the same.

Recommended lighting powers (high scale):

Stairs, basements, attics: 30 lux

Garages, hallway, utility room: lux 60

Kitchen, games room, lounge, dining room, local
domestic work, waiting room: 250 lux

Eating, cooking and leisure work, works
secretarial and laboratory: 500 lux

Entrance hall, shower room, bathroom, bedroom
for children, cellar: 720 lux

Reading, writing, handicrafts, homework, DIY,
drawings, make-up: 750 lux

Architecture, precise works, exact control,
differentiate colors 7000 lux


Regulatory powers according to wiki

streets, roads and highways: 15 to 50 lux

intermittent activity or simple task: 125 lux

average mechanics, office work: 200 lux

fine mechanics, drawings: 400 lux

precision mechanics, electronics: 600 lux

difficult tasks, laboratories: 800 lux


Examples of other common lighting powers (to compare):

sensitivity of a low level camera: 0,001 lux

full moon night: 0,5 lux

well lit night street: 20 - 70 lux

living room: 100 - 200 lux

well-lit apartment: 200 - 400 lux

work area: 200 - 3 000 lux

night stage: 1 500 lux

outside by overcast sky: 25 000 lux

outside in full sun: 50 000 to 100 000 lux


The disparity of these values ​​confirms my 1ere remark on the subjectivity of lighting.

Calculation method of lighting design

It's pretty simple.

- 1 Lux = 1 Lumens / m²
- With the area of ​​the room to be illuminated and the number of lux desired, you get a number of Lumens.
- By knowing the Lumens per bulb, you have the number of bulbs needed to install and thus light points / sconces / fixtures to install.

Example of dimensioning with 3 choice of types of bulbs.

120 Lux requested in 36 m² room will require a source of 120 * 36 = 4320 lumens

A good fluorescent bulb has a yield of 50 65lm / W so it will require a compact fluorescent power of 4320 / 50 = 86 W.

It should be known that the higher the power of the bulb, the better its performance.

Conclusion

Here is for the method, it is necessary to keep in mind the strong subjectivity of the concept of lighting (in the same kind as "the tastes and the colors ..."), that one is not near Lux and that it is always possible to add a free-standing ambient lighting in addition ... the color of the walls or the furniture, for example, has a strong influence on the ambient light!
Last edited by Christophe the 29 / 11 / 14, 11: 56, 2 edited once.
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Christophe
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by Christophe » 29/04/14, 13:06

Another painting that does not go through the Lumens but the electric power:

Image

In led, divide the incandescent column by 7-8
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Christophe
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by Christophe » 12/12/15, 12:19

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