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Lighting Calculation

 Lumenor flux :

                           Amount of light emitted by lumenor source in one second is called Lumenor flux.

           It's units is Lumen

                         (Or)

 The light energy given out by light is called Lumenor flux.


Lumen :-

              Lumen is the SI unit of lumenor flux

                   1 lumen = 10.57×candle power


Lux :- 

         Number of lumens required per square meter.

Elumination :-

                      The density of light flow (or) insident on a surface is called Elumination.

       

              Elumination = lumen flux÷ Area


Room Index :-

             It is define as the ratio of length, width and height.


Room Index = RI= L×W÷ (L+W)×H

( L-length, W-width, H-height).


All dimensions should be in meters.


Room Index is Calculate for CUF

CUF - Co-efficient of Utilizes factor.

(It is on the catlog of company)


Reflection factor : Wall, Ceiling, Floor etc.


Fixtures

                 Fixtures is a place were we use to install light unit.


Number of fixtures = [L×W×Lu×Level]÷[ CUF×M.F×Total lumen×Type of fixtures].


( Type of fixtures = lighting points)


M.F(Maintenance Factor) :- 

                               Maintenance factor is depends on three things,

1) Initial lumen

2) Average lumen

3) Environment :- a) Neat

                                 b) Normal 

                                 c) Untidy


Neat :- AC room - 0.8

             Non-AC (Bed room,Hall) - 0.7


Normal :- Kitchen - 0.6


Dirty / Untidy :- Store room - 0.5


Types of Lamp :

  LAMP                  Rating(W)            LU/Watt    

1)Incandescent   10,16,18,40,40         8-20

Lamp.                 60,100,200W               

                                

2)Flurance            11,14,18,28,36        60-40

      Lamp                 40,54W


3)Compact             4,9,11,13,14,           55-60

 Flurancent           18,25,36,40

    Lamp.                      45,80W


4)Light emitting               -                        80

    Diode(external)


5) Sodium Vrap     70,100,150             80-110

    Lamp (SVL)         250,400W


6) Mercury Vrap      40,60,80,100         45-65

        Lamp(MVL)      125,150,250W


7) Metal hallogen      70,100,125            70-90

       Lamp(MHL)            250,400W



Standard LUX LEVEL for RESIDENTIAL purpose :-


Entrance hall                                   300Lux

Master bedroom                              250lux

Bedroom                                            200lux

Dinning hall                                      200lux

Kitchen                                               300lux

Total/Bathroom                                 150lux

Corridor/parking/lobby                   100lux

Prayer room                                       200lux



Standard LUX LEVEL for COMMERCIAL purpose :-


General shop                                         300lux

Shopping mall                                       750lux

Indoor station                                        800lux

Outdoor station                                   2000lux

Bar & Restaurant                                  100lux

GYM/Bank/General ward                    300lux

Class room/ATM/LAB                           400 lux

Seminar hall/ICU                                   500lux

Supermarkets/Function hall               600lux

Operation theater                                  600lux

Electrical room                                      200 lux

Work shop                                              500lux


Figure :





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