The lighting technique covers the calculation methods necessary to provide an economical and quality lighting in a system. The following method is generally used in a lighting calculation. The average luminous intensity of the area to be illuminated, the calculation method and equations in accordance with the purpose of illumination are given in the tables below.
EQUATION
EXPLANATION
Number of bulbs
Required total luminous flux (lm)
Luminous flux given by a bulb (lm.)
Zone index (depending on site dimensions)
Length (m)
Width (m)
Height of light source to working plane (m)
Height of light source from ground (m)
Height of working plane from floor
The required illuminance level (LUX) is selected from the table
Area of ​​the area to be illuminated (m 2 )
The contamination factor of the facility (selected from the Table)
The light reflection efficiency of the facility. Ceiling limiting the lighting area is selected from the table depending on the reflection factors of the wall and floor, the zone index and the selected luminaire type.
ROOM DIMENSIONS
CONTAMINATION FACTOR: 1.25
LIGHT INTENSITY
LUMINAIRE TYPE
Luminous flux of “TL” 54/40 w bulb ØL
a=13 m.
CEILING: OPEN 0.8
E=500 LUX
(SELECT FROM THE TABLE)
TMS 240
b=5.5 m.
WALL: LIGHT DARK 0.5
LAMP TYPE
H=3 m.
FLOOR: DARK 0.1
“TL” 54/40 W.
2100 Lumens
SEQ ID
CALCULATION
CONCLUSION
h=H-h1
h=3-0.85 m.
h=2.15 m.
k=2
The lighting efficiency factor of the facility (selected from the Table) =0.46
The contamination factor of the facility (selected from the Table) d=1.25
A=axb
A=13×5.5 m
A=71.5 m2
ØT=97146
Z=46 pieces
Z=46 fluorescent bulbs will be used
Since there are 2 “TL” 54/40 W. fluorescent bulbs in a luminaire,
23 TMS 240 luminaires will be used in office lighting.
E=497 LUX
In an office lighting, an illumination level of E= 497 Lux is obtained.
Ceiling
Walls
Study
0.50
0.30-0.70
plane
0.25-0.35
0.40-0.60
0.8
0.3
0.01-0.15
0.5
0.50-0.60
0.10-0.15
0.20-0.25
0.15-0.20
0.35-0.55
0.45-0.55
0.7
0.2
0.40-0.45
0.60-0.70
0.90
0.20-0.30
0.20-0.40
0.1