Conversion Lux Lumens

Lighting: Suggested power conversion Lumens and Lux

Conversion of Lumens to Lux and examples of recommended lighting powers depending on the location or use of the room (in Lux)

The Lux is a lighting unit, the Lumens too. How to convert Lux to Lumens and vice versa? Here's what you need to know about them:

  • Lux = 1 1 Lumens per m²
  • The Lux is a unit that characterizes the lighting rendering (consequence)
  • The Lumens is a unit that characterizes the power of a light source (cause)
  • Here are the actual values ​​in lumens for light bulbs, LED spots or strips
  • Example: 800 lumens bulb put into a piece of 12m², give a light 800 / 12 67 Lux =
  • Lumens are always specified on the packaging of an economical or LED bulb provided that it is of quality
  • With the surface of the part to be illuminated and the desired number of lux, you get a number of Lumens
  • By knowing the Lumens per bulb, you have the number of bulbs necessary to install and therefore of light points / sconces / lights to install
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Then, you should know that the lighting power is a fairly subjective quantity:

  • Some people will easily settle for 80 lux in their living room while others will want 300! Lighting is like tastes and colors…
  • Also the type of light (lighting spectrum) plays a lot on the impression of light power: a bulb in neutral white light or solar color will give a much greater impression of light than a bulb of the same power in warm color - 2700 ° K - for the same power consumption!

Recommended lighting powers (high scale)

  • Stairs, basements, attics: 30 lux
  • Garages, hallway, utility room: lux 60
  • Kitchen, game room, lounge, dining room, local housework, waiting room: lux 250
  • Room, kitchen work and leisure, secretarial and lab: 500 lux
  • Entrance hall, shower room, bathroom, children's room, pantry: 720 lux
  • Reading, writing, crafts, homework, crafts, drawings, makeup: 750 lux
  • Architecture, accurate work, precise control, differentiate colors 7000 lux
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Regulatory lighting powers according to wikipedia

  • Streets, roads and highways: 15 50 to lux
  • intermittent activity or simple task: 125 lux
  • average mechanics, office work: 200 lux
  • fine mechanics, drawings 400 lux
  • precision engineering, electronics: 600 lux
  • difficult tasks, laboratories 800 lux

Examples of other common lighting powers (to compare)

  • Low level camera sensitivity: 0,001 lux
  • Moonlit Night: 0,5 lux
  • Well lit night street: 20 - 70 lux
  • Local life: 100 - 200 lux
  • Well-lit apartment: 200 - 400 lux
  • Work space: 200 - 3 lux
  • night stadium: 1 500 lux
  • Outside overcast sky 25 000 lux
  • Outdoors in direct sunlight: 50 000 100 000 to lux

The disparity of these values ​​confirms human subjectivity in the field of lighting ...

More:
Example of a practical calculation of the lighting power of a room
- Topic on calculation of the lighting power and the number of bulbs required?
Choosing lighting in the kitchen and bathroom

4 comments on "Lighting: Lux power and conversion in Lumens"

  1. "Example: a bulb of 800 lumens put in a room of 12m ², will give a lighting of 800 / 12 = 67 Lux"

    wrong ... it would require that the light is uniformly distributed over the entire surface, which is impossible

    illumination in lux is inverssement proportional to the square of the distance from the lamp

  2. Hello

    As part of my decorator mandate I have to provide lighting for a multipurpose room whose measurements are: mx 24 10 4.13 x (height)
    knowing that my room doing 240 m² and is high that you advise me?
    I would ask
    Dalle led 45W - 297 1197 mm x mm - neutral white Vision EL
    Ref. Product: 77604
    can you give me the number of slab and rates
    With thanks
    Richard DESVAUX for ADVENTURE INDOOR
    0689376157 or 0041789415170

  3. I wish to illuminate a cold room of 600 M2 and 5 M of height, can you advise me the power to install for good lighting

    Thank you

  4. Hello, I want to illuminate a meeting room of 7,5 * 5,4 and height of 3 put with spotlights of 1 * 3W. how many bright spots could I have. cordially.

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