5 years - Sill Lighting

Direct glareDirect glare is generated byunsuitable or incorrectly installedluminaires with excessive radiantintensities, as with free beamlamps where the user has adirect view of the light sourcewithin his field of view, but alsofrom "uncontrolled" windowareas.Direct glareReflective glareUGRThe UGR method takes intoaccount the layout of theluminaires in the room andevaluates the glare produced bythe entire lighting system for aspecific observer's position. A lowUGR value means nonglaring.Simple tables are the implementfor the practical application ofthe UGR method.Suitability samples UGR value:< 16 for drafting rooms< 19 for offices and control rooms< 22 for precision industrial tasks< 25 for medium industrial tasksand< 28 for heavy industrial tasksLight densityReflectanceLight is invisible and onlyrecognisable in interaction withthe material it illuminates.The abstract, invisible size of theilluminance (lx) defines the amountof light. What we perceive as theimpression of luminosity is actuallythe light reflected from thematerial: the light density (cd/m 2 ).Light hits an object, is radiatedoff it in a changed form and thuscontains all the visual informationabout the object. It is thus ofgreat importance to qualitativelighting planning.Untrue colour representation of alinear distribution of luminanceConstruction mat.ρStructural glazing 0.07Brick, red 0.15Oak, dark 0.15Walnut, dark 0.20Concrete 0.30Oak, light 0.40Maple, Birch 0.60Tile, white 0.70Plaster (Gypsum) 0.80Recommended mean reflectionfactors forthe ceiling 0.7 to 0.9the wall 0.5 to 0.8the floor 0.2 to 0.4work surfaces,furniture and devices 0.2 to 0.5Coloursρblack 0.05dark red 0.10medium grey 0.20light brown 0.30light grey 0.40sky blue 0.40pink 0.45light green 0.45light yellow 0.70white 0.80Recommended properties ofgloss for surfaces, furniture andappliancesDegree of glossmatt tosatin finishedwww.wila.com 137