3Some Unique Terms in Lighting LUMEN :The lumen is the time rate flow of light10 lumens lumens lumens
42. LUMINOUS INTENSITY (candlepower ): Light emitted in a particular direction.
53. 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
6LIGHTING DESIGN PROCEDURE A. Analyzing The SpaceB. Source SelectionC. lumanaire selectionD. lighting calculation method
7A. Analyzing The SpaceIs the area to be used for more than one purpose?
8B. Source SelectionHigh intensity discharge (HID) lamps[ industrial lighting].Fluorescent lamps are used for [offices\Houses\shops…].Incandescent lamps [bedrooms\toilets ].
9C. Lumanaire Selection. ENVIRONMENTS: - Hazardous Locations. - High or Low TemperaturesHEIGHTSome luminaries are designed for use heights that is below 7.6 meters.
10D. 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
14Coefficient of Utilization (CU) Room Cavity Ratio (RCR)Reflectances
15ReferencesFrier, 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.