What is the formula to calculate the number of lamps in a given cross sectional area?

The required No of Fixture=required Lux x Room Area/MF x UF x Lumens per fixture

MF =Maintenance factor

UF= Utilization Factor

SHR=Space hight ratio

Max spacing between the fixtures

Max spacing=Cielling to desk hight x SHR

Number of rows required

No of rows=width of room/max spacing

The axial spacing between each fixture

Lenght of room/number of the fixture in each row

transverse spacing

=width of room/number of the fixture in the row

NUMBER LAMPS = ILLUMINATION LEVEL(LUX REQUIRED) X AREA} /  (FXMFXUF)

NO. OF LAMPS(N) = {ILLUMINATION LEVEL(LUX REQUIRED) X AREA} /  (FXMFXUF)

WHERE F= FLUX IN LUMENS

                MF=MAINTENANCEFACTOR

               UF=UTILIZATION FACTOR

number of lamps = (AREA*LUX) / (LOL*COU*MF)

Wher,

          Area= area of room

          LUX= Required lux level of room 

          LOL = Lumens of light you are using 

          MF= Maintanence factor (for ac room which is0.8, for non ac room0.7,for road side shop .6,                    for work shops which is .5)

           COU= Room index = (length*width) / ( (length + width)*Hm )

            Hm = Room height - Reference plane Height

All calculation already calculated by Dialux 

and Dialux consider all the factors which specified before calcualting

no of luminaire= llumen required x Area m/lamp lumen xU F x M F

number of lamps = (AREA*LUX) / (LOL*COU*MF)

Wher,

          Area= area of room

          LUX= Required lux level of room 

          LOL = Lumens of light you are using 

          MF= Maintanence factor (for ac room which is0.8, for non ac room0.7,for road side shop .6,                    for work shops which is .5)

           COU= Room index = (length*width) / ( (length + width)*Hm )

            Hm = Room height - Reference plane Height

donde.

• Em es la iluminancia media sobre la calzada que queremos conseguir.
•  es el factor de utilización de la instalación.
• fm es el factor de mantenimiento.
•  es el flujo luminoso de la lámpara.
• A es la anchura a iluminar de la calzada que en disposición bilateral pareada es la mitad (A/2)y toda (A) en disposiciones unilateral y tresbolillo
• d es la separación entre las luminarias.

The required No of Fixture=required Lux x Room Area/MF x UF x Lumens per fixture

one meter square

 must have 23 va