3 Some Unique Terms in Lighting LUMEN :The lumen is the time rate flow of light10 lumens lumens lumens
4 2. LUMINOUS INTENSITY (candlepower ): Light emitted in a particular direction.
5 3. ILLUMINANCE (level of illumination ): Calculated as the number of lumens (lm) per unit area.The units : A. footcandles (fc) = lm/ft2B. lux (lx) = lm/m2
6 LIGHTING DESIGN PROCEDURE A. Analyzing The SpaceB. Source SelectionC. lumanaire selectionD. lighting calculation method
7 A. Analyzing The SpaceIs the area to be used for more than one purpose?
8 B. Source SelectionHigh intensity discharge (HID) lamps[ industrial lighting].Fluorescent lamps are used for [offices\Houses\shops…].Incandescent lamps [bedrooms\toilets ].
9 C. Lumanaire Selection. ENVIRONMENTS: - Hazardous Locations. - High or Low TemperaturesHEIGHTSome luminaries are designed for use heights that is below 7.6 meters.
10 D. Lighting Calculation Method E = (N * LL * CU * LLF)/(area)Where E = maintained level of illuminationN = number of luminaireArea = area of the space to be lightedLL = initial rated lamp lumensCU = coefficient of utilizationLLF = light loss factor
14 Coefficient of Utilization (CU) Room Cavity Ratio (RCR)Reflectances
15 ReferencesFrier, John P. and Mary E. Gazley Frier. Industrial Lighting Systems McGraw-Hill, Inc.Kaufman. John E. and Jack F. Christensen. IES Lighting Handbook Waverly Press, Inc: USA.Nuckolls, James L. Interior Lighting for Environmental Designers John Wiley and Sons, Inc: USA.