ee 445 course lighting system design done by meshabbab ali done for dr alaa hussein n.
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EE 445 Course Lighting System Design Done By: Meshabbab Ali Done for: Dr. Alaa Hussein. Lighting System Design . Is it Random Process?. Some Unique Terms in Lighting. LUMEN : The lumen is the time rate flow of light

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EE 445 Course Lighting System Design Done By: Meshabbab Ali Done for: Dr. Alaa Hussein


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Lighting System Design

Is it Random Process?

some unique terms in lighting
Some Unique Terms in Lighting
  • LUMEN :

The lumen is the time rate flow of light

10 lumens350 lumens 750 lumens

3 illuminance level of illumination
3. ILLUMINANCE (level of illumination ):

Calculated as the number of lumens (lm) per unit area.

The units : A. footcandles (fc) = lm/ft2

B. lux (lx) = lm/m2

lighting design procedure
LIGHTING DESIGN PROCEDURE

A. Analyzing The Space

B. Source Selection

C. lumanaire selection

D. lighting calculation method

a analyzing the space
A. Analyzing The Space

Is the area to be used for more than one purpose?

b source selection
B. Source Selection
  • High intensity discharge (HID) lamps[ industrial lighting].
  • Fluorescent lamps are used for [offices\Houses\shops…].
  • Incandescent lamps [bedrooms\toilets ].
c lumanaire selection
C. Lumanaire Selection.
  • ENVIRONMENTS:

- Hazardous Locations.

- High or Low Temperatures

  • HEIGHT

Some luminaries are designed for use heights that is below 7.6 meters.

d lighting calculation method
D. Lighting Calculation Method

E = (N * LL * CU * LLF)/(area)

Where E = maintained level of illumination

N = number of luminaire

Area = area of the space to be lighted

LL = initial rated lamp lumens

CU = coefficient of utilization

LLF = light loss factor

light loss factors llf
Light loss factors (LLF)
  • Temperature, voltage and ballast Performance.
  • Accumulation of dirt on interior surfaces.
  • Lamp lumen depreciation.
  • Lumanaire Dirt depreciation.
selecting lamp lumen ll
Selecting Lamp Lumen (LL)

ILL = 2 * maintained illumination level (E) *(hrc)2

coefficient of utilization cu
Coefficient of Utilization (CU)
  • Room Cavity Ratio (RCR)
  • Reflectances
references
References
  • Frier, John P. and Mary E. Gazley Frier. Industrial Lighting Systems. 1980. McGraw-Hill, Inc.
  • Kaufman. John E. and Jack F. Christensen. IES Lighting Handbook.1972. Waverly Press, Inc: USA.
  • Nuckolls, James L. Interior Lighting for Environmental Designers.1976. John Wiley and Sons, Inc: USA.