UNIVERSITY OF HONG KONG Faculty of Engineering M.Sc.(Eng) in Building Services MEBS 6002 Lighting Engineering
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1 E direct WP = F x UF (0,0,0) x MF Area of working plane E direct W = F x (DLOR UF (0,0,0) ) x MF Area of 4 walls E direct C = F x ULOR x MF Area of ceiling cavity K. F. Chan (Mr.) MEBS SCALAR ILLUMINANCE E s is the average illuminance on the surface of an infinitesimally small sphere at a point in space. K. F. Chan (Mr.) MEBS
2 SCALAR ILLUMINANCE For point sources, direct illumination E s = E max 4 For satisfactory appearance, the mean scalar illuminance should be at least 40% of the illuminance on the horizontal plane. K. F. Chan (Mr.) MEBS For inter-reflected illumination E s = E h (k+0.5ρ) K. F. Chan (Mr.) MEBS
3 VECTOR/SCALAR RATIO K. F. Chan (Mr.) MEBS Single point source K. F. Chan (Mr.) MEBS
4 Multiple point source K. F. Chan (Mr.) MEBS Single diffuse K. F. Chan (Mr.) MEBS
5 MODELLING EFFECT K. F. Chan (Mr.) MEBS CYLINDRICAL ILLUMINACE For point source,direct illumination Ec = Emaxsinθ π For inter-reflected light, Ec = 1.5Es 0.25 Eh(1+ρ f ) where ρ f = reflectance of the floor cavity Cylindrical illuminance gives better guide to the lighting of vertical surfaces. K. F. Chan (Mr.) MEBS
6 CYLINDRICAL ILLUMINANCE Ec/Eh Modelling Harsh Good Weak For a satisfactory installation, mean cylindrical illuminance should be at least 0.4 of the horizontal illuminance. K. F. Chan (Mr.) MEBS VECTOR ILLUMINATION The illumination vector at a point is the maximum difference of the illuminance across diameters of an infinitesimally small sphere at that point. Vector/Scalar ratio Modelling Weak Good Harsh Appearance Dull Pleasant Unacceptable K. F. Chan (Mr.) MEBS
7 K. F. Chan (Mr.) MEBS K. F. Chan (Mr.) MEBS
8 K. F. Chan (Mr.) MEBS K. F. Chan (Mr.) MEBS
9 MODELLING EFFECT Direct ratio Flux fraction ratio Vector/scalar illuminance ratio, 1.2 to 1.8. K. F. Chan (Mr.) MEBS ROOM APPEARANCE Direct ratio Flux fraction ratio Wall / ceiling illuminance ratio K. F. Chan (Mr.) MEBS
10 ROOM APPEARANCE DR = DF F DLOR FFR =ULOR DLOR K. F. Chan (Mr.) MEBS ROOM APPEARANCE K. F. Chan (Mr.) MEBS
11 Illuminance Ratio K. F. Chan (Mr.) MEBS Illuminance Ratio K. F. Chan (Mr.) MEBS
12 MULTIPLE CRITERION DESIGN Recommended Ewall/Eh between 0.5 and 0.8 Recommended Eceiling/Eh between 0.3 and 0.9 Preferred E/Es between 1.2 and 1.8 (* see IES TR15 July, 1997 and page 75 to 78 of CIBSE Code for Lighting 2002) K. F. Chan (Mr.) MEBS VECTOR / SCALAR RATIO K. F. Chan (Mr.) MEBS
13 RECOMMENDED REFLECTANCES TO ACHIEVE LUMINANCE RATIO K. F. Chan (Mr.) MEBS ROOM APPEARANCE Any brightly lit surface will appear to recede from the observer high overall illuminance makes an interior look more spacious. A room with bright ceiling and dark walls will seem taller and more formal. A room with brighter walls will seem friendlier and larger in plan. A room with dark ceiling will give an oppressive feeling. K. F. Chan (Mr.) MEBS
14 Class of visual task Critical, often with a fixed direction of view Critical, but general direction of view Ordinary task with general direction of view Large task or limited viewing time No specific visual task or direction of view GLARE Examples Drawing offices, very fine inspection Offices, libraries, computer buildings Kitchens, reception areas, fine assembly work Stockrooms, medium assembly work Rough industrial work, indoor parking areas. Limiting glare index K. F. Chan (Mr.) MEBS INSTALLED POWER DENSITY (Taken from Table 2.5 of CIBSE Code for Lighting, 2002) K. F. Chan (Mr.) MEBS
15 DISPLAY ILLUMINANCE RATIO Display Effect Subtle Moderate Strong Dramatic Illuminance Ratio 5:1 15:1 30:1 50:1 Apparent Brightness Ratio 2.5:1 5:1 7:1 10:1 K. F. Chan (Mr.) MEBS K. F. Chan (Mr.) MEBS
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