How to calculate the number of fittings you need for a room

THE LUMEN METHOD FOR CALCULATING LIGHTING REQUIREMENTS

 

This method is a very simple way  to calculate how many luminaries will be required to light a room. This is a little rough but it is a good starting point for lighting design.  It works best on a regular shaped room with a light colour finish and minimal natural light.

 

  1. Determine the required lux level for the room based on the Aus/NZ standards (ASNZ1680.2.4:1997). These lux levels are based on the type of activity that occurs in the room. Obviously a factory floor needs more light than a hall way. Lux refers to the light that hits a surface; one lux is equal to 1 lumen per square meter. A lux measurement is taken using a lux meter. These can be obtained cheaply from ebay or Jcars.

The table below shows recommended lux levels for various rooms.

  1. Measure the size of the room in meters squared.
  2. Calculate the total lumens required to achieve the desired lux level using the following calculation.

total lumens required = (desired lux level) x (area in meters squared)

just  for  clarification a  lumen is  a    measure of  the  total     light  leaving a  light    source. Special  equipment     is  required  to measure it. But all      LED manufacturers  will  state the  luminaries  total  lumen  output

  1. Now divide the total lumens required by the lumen rating of the led luminary to determine the quantity required.

 

LUX LEVELS – Australian Standard Lux levels

                        AS1680.2.4:1997 table E1 gives minimum Lux levels

 

 

Lux

Area

 

 

 

 

40

Corridors

 

Passageways

80

Warehouses involving search & retrieval tasks

 

Stairs

160

Entrance halls

 

Foyers

 

Waiting Rooms

 

Canteens

 

Machine shop general work bench

240

Counters

 

Kitchens (food preparation   area)

320

Offices

400

Machine shop   high tolerance work bench

600

Electronic assembly work

 

Jewelry & watch   repair

 

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