Interior And Exterior Lighting Control

Interior And Exterior Lighting Control 

Inte­ri­or And Exte­ri­or Light­ing Con­trol for Elec­tri­cal Ener­gy Audit­ing The fol­low­ing steps.… 

Exte­ri­or Light­ing Control
Inte­ri­or light­ing control

Lighting Shut off Automatically 

Auto­mat­ic light con­trol devices can be installed to illu­mi­nate the inte­ri­ors of build­ings with an area of ​​more than 500 m² 

If the build­ing, office, con­sult­ing room, meet­ing place is less than 30m, how many peo­ple can con­trol the light using the appro­pri­ate occu­pan­cy sensors 

Occu­pan­cy sen­sor can also be used in stor­age areas where items are stored. Else­where you can use the fol­low­ing auto­mat­ic con­trol tools 

  • Pro­gram­ma­ble timers can be set up where the area is less than 2500 m² on a sin­gle site 
  • Those in the room can set up ccu­pan­cy sen­sors to switch off all lights with­in 30 min­utes of leaving 
  • A sep­a­rate switch must be set to man­u­al­ly turn on-off even when using occu­pan­cy sen­sors in light fittings 

Day Time Control In Lightings Area 

Man­u­al or auto­mat­ic con­trol devices must be fit­ted to lamp fit­tings locat­ed in nat­ur­al day­light areas larg­er than 25 meters square area 

  1. The out­put of lamp fit­tings can be reduced by up to 50 percent 
  2. Com­plete con­trol of lamp fit­tings where nat­ur­al day­light is available 

Space Control

Where the ceil­ing of a build­ing has very high walls, there should be at least one con­trol device to con­trol the lights when set­ting the lights in general 

This con­trol­ling device can be oper­at­ed man­u­al­ly or on sen­sors. Where the total area is less than 1000 m², each con­trol device must con­trol a max­i­mum of 250m area 

Where the area is more than 1000 m², what is the max­i­mum con­trol capac­i­ty of each con­trol device? need to con­trol the area. All con­trol tools should be set up for easy use

Exterior Lighting Control 

All lights out­side the build­ing should be con­trolled using pho­to sen­sor or time switches 

This allows the lights to be switched off when licht is not required 

Extra control

con­trol tools can be fit­ted with the fol­low­ing light­ing appli­caitons to bet­ter con­trol the equipment 

  • Sep­a­rate con­trols should be set for lights above 300 m² in areas where objects are on display 
  • A mas­ter con­trol switch must be installed for all light fit­tings per­ma­nent­ly installed in hotels (restau­rants) and road­side eateries 
  • Work­space lights, shelves and cab­i­nets should have a mas­ter con­trol or switch mount­ed sep­a­rate­ly on the wall for easy-to-use and code writing 
  • For grow­ing plants. Sep­a­rate con­trol switch­es should be set for lights and for heat­ing food 

Exterior Building Ground Lighting 

Effi­ca­cy of lamps over 100 watts in floor-mount­ed light fit­tings to illu­mi­nate the exte­ri­or of build­ings should be 60 lumens / watt 

Oth­er­wise you have to con­trol the lamp fit­tings using motion sensors 


Light­ing sys­tems inside build­ings should not exceed the allow­able indoor light­ing pow­er. The allow­able light­ing pow­er is stat­ed in the build­ing code in two ways

  • Build­ing Area Method 
  • Space Func­tion Method 

Building Area Method 

In this method you need to find the area of ​​the total light­ing space in each building 

Mul­ti­ply this area by the LDP (Light­ing Pow­er Den­si­ty) spec­i­fied for the respec­tive area. This val­ue is the pow­er of the allow­able light at that par­tic­u­lar location 

Sim­i­lar­ly for oth­er loca­tions, find the allow­able light­ing pow­er and add it all up to cal­cu­late the total power 

Build­ing Area Method 

Space Function Method 

S.NOSpace Func­tionLDP W/m²
3Class room15.1
5Sports Area4.3
6Con­ven­tion centre7.5
7Reli­gious buildings18.3
8Con­fer­ence hall14
Space Func­tion Method

In this method, to find the total area of ​​the space sep­a­rat­ed by walls that are 80 per­cent of the height of the ceil­ing or above, mea­sure from the cen­ter of the par­ti­tion wall 

In addi­tion, the bal­cony and pro­jec­tion should be tak­en. Mul­ti­ply the LDP for the spe­cif­ic area spec­i­fied in the table below by the area thus found 

Thus the wastage in each area must be found by adding the sum of the light and find­ing the wastage for the required light­ing system 

Interior Lighting Power 

Installed inte­ri­or light­ing pow­er is the amount of total pow­er required for light fit­tings and bal­lasts, lamps, curent reg­u­la­tors, con­trol device, etc. 

  • The wattage of ordi­nary bulbs with a bal­last-free medi­um­base is the max­i­mum wattage indi­cat­ed on it 
  • The wattage of the lamps in the bal­last is equal to the sum of the input pow­er of the lamp and the bal­last spec­i­fied by the manufacturer 
  • The wattage of fus­es used for over­load pro­tec­tion, such as cir­cuit break­ers, should take into account its max­i­mum load 


The pow­er of the lights installed out­side the build­ings should not exceed the val­ue spec­i­fied in the table below 

S.NOExte­ri­or Light­ing ApplicationPow­er Limit
1Build­ing Entrance with
13W/M² of dec­o­rat­ed area
2Build­ing Entrance90 W/length in metre of door width
3Build­ing Exit60 W/length in metre of door width
4Front of a building2 W/m² if ver­ti­cal area of that place 

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