Chartered Institute of Building Service Engineers (CIBSE) code for interior lighting design
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1 Chartered Institute of Building Service Engineers (CIBSE) code for interior lighting design
2 The maintenance factor gives an estimate of how lighting conditions will deteriorate through everyday use. Dust and dirt Aging of lamps Cleaning of room surfaces It should be noted that without detailed knowledge of the maintenance plan a maintenance factor of 0.8 must be used. MF = RSMF x LMF x LLMF x LSF
3 Where: RSMF: Room Surface Maintenance Factor (dirt on the surfaces of the room) LMF Luminaire Maintenance Factor (dirt on luminaire)
4 Where: LLMF: Lamp Lumen Maintenance Factor (dirt on the lamp) LSF Luminaire Survival Factor (reduced light output due to lamps failing)
5 UF = lumens received on working plane lumen output of luminaires Utilisation factor takes account of the loss of light due to absorption on room surfaces
6 Type of luminaire Room index Reflectance of room surfaces
7 A luminaire with a concentrated light output directed on the working plane will have a higher UF than a luminaire with a dispersed output
8
9 This takes into account the length and width of the given room, also the height of the luminaires above the working plane (Hm). RI = L x W (L + W) Hm
10
11 Brighter colours with high reflectance result in a higher UF. Note: A high UF means fewer lamps are needed (see formula) resulting in a more energy efficient light design.
12 Ceiling Walls Floor Room index
13 A garage 20m long by 12m wide with a ceiling height of 6m is required to be illuminated to a level of 200 lx at a working plane height of 1 m. The luminaires will be suspended 2m below the ceiling height. The reflectance's are as follows: Ceiling 0.5, Walls 0.5, Floor 0.2. The utilisation factor can be calculated from the previous table.
14 Room index: RI = L x W (L + W) Hm Therefore: = 20 x 12 ( ) 3 = = 2.5
15 Therefore UF is.. RI C.W.F UF
16 A garage 26m long by 16 m wide with a ceiling height of 7m is required to be illuminated to a level of 500 lx at a working plane height of 1.5 m. The luminaires will be suspended 1.5m below the ceiling height. The reflectance's are as follows: Ceiling 0.3, Walls 0.5, Floor 0.2. Calculate the utilisation factor from the previous table.
17 Room index: RI = L x W (L + W) Hm Therefore: = 26 x 16 ( ) 4 = = 2.48 (2.5)
18 UF
19 This is the ratio of space between luminaires to their installed height above the working plane. Manufactures will generally specify a recommended SHR to ensure their products best performance.
20 Example Room dimensions: Ceiling height = 4m Working plane = 1m (recessed luminaire) Manufactures recommended SHR 2:1 Therefore: SHR = 2:1 = 6:3
21 Calculate the number of luminaires required for a given room. Dimensions: L = 20m W = 40m H = 8m Luminaire suspended 1.5m from ceiling Working plane 1m Manufactures recommended SHR (1.5:1)
22 Gap from working plane to luminaire = 5.5m Therefore: SHR 1.5 : : 5.5 Width = 40m = 4.8 luminaires 8.25 Length = 20m = 2.4 luminaires 8.25
23 s o u rce I ca n d e l a Luminous Intensity Luminance fl o w l u m e n s Luminous Flux i l l u m i n a n ce E l u x Fi g. 1.9 Illuminance
24 Luminous Intensity The measure of light from a source.i.e. a lamp. It is measured in candelas (cd). Symbol: I Luminous Flux It is the rate at which light flows from a source. It is measured in lumens (lm). Symbol: F
25 Illuminance The measure of the amount of light falling on a surface. It is measured in lux (lx). Symbol: E Luminance Is the measure of the light intensity leaving the surface which has been illuminated by a given source. It is measured in candelas per meters squared (cd / m²) Symbol: L
26 Typical recommended maintained Lux levels: Corridors and stairs 100 Warehouses Medium bench and machine work 500 Fine painting spraying and finishing 750 Printing inspection 1000 Proof reading / drawing offices 750 General offices (desk based) 500 General offices (screen based) 300 Supermarkets 750
27 E = (F x n) x N x MF x UF A
28 Where: E = Average Illuminance (lux) F = Initial lamp lumen output (lm) N = Number of luminaires n = Number of lamps per luminaire MF = Maintenance factor UF = Utilisation factor A = Area (m²)
29 This method is most suitable for interior lighting design, where a high proportion of light on the working plane is reflected by internal surfaces. The lumen method, sometimes called the luminous flux method of calculation, is normally used to calculate the average illuminance (Lux) on working planes, or to calculate the number of luminaires required providing a specified average illuminance in rooms.
30 A factory floor, 30m x 20 m, is to be illuminated with 2 x 58 W LPMV luminaires. Calculate the number of luminaires needed to maintain an average illuminance of 500 lux. The initial lamp output is 5,200 lumens. Calculations are to be carried out using a MF of 0.8 and a UF of 0.7
31 E = (F x n) x N x MF x UF A Therefore: N = E x A (n x F) x MF x UF N = 500 x (30 x 20) (2 x 5,200) x 0.8 x 0.7 = (52 luminaires)
32 A hotel reception area, 18m x 11 m, is to be illuminated with 40, 70 W, 2 pin pod MBI luminaires. The initial lamp output is 6,600lm, the MF is 0.8 and the UF is Calculate the average illuminance in the reception area. Also calculate the efficacy of the lamp.
33 E = (F x n) x N x MF x UF A = 6600 x 40 x 0.8 x x 11 = lux Efficacy = 6600 / 70 = 94.3 lm/w
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