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Home > English Support > SmartCONTROL > Practical informations > 07 - How to calculate the number of bulbs and their power required for each room ?
07 - How to calculate the number of bulbs and their power required for each room ?
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In order to determine precisely the necessary number of LED spots per room there is a unit measuring the illuminance: lux. It is calculated as follows: lux = lm / m2 (lm = lumen, m2 = square meter). The lux makes it possible to determine the luminous flux received for a given unit of surface. Once the required number of lux is determined, you can simply reverse the previous formula to convert the number of lux to lumen (lm = lux x m2). Simply divide the total lumen needed for a room by the amount of lumen emitted by a spot to find the spot numbers per room.
For a home, the number of lux for optimal lighting will depend on the daily use of each room:

  • Passage areas, corridors, stairs> 100 lux
  • Cloakroom, kitchen, bathroom and shower room> 200 lux
  • Library> 300 lux
  • Writing, Reading, meeting room, conference room> 500 lux

 

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