How to meet the requirement of limiting glare? The effect of glare can be evaluated on the basis of the luminance of the luminaire from different directions, on the geometrical arrangement of the interior, and on the designed En nominal illuminance of the room. Each En nominal illuminance and G degree of glare has a so-called limit curve. Glare is adequately limited if the L(γ ) curve, i.e. the luminance of the luminaire expressed as a function of various directions of view, is to left of (is smaller than) the limit curve of a given requirement.
Good catalogues of luminaires give the L(γ ) limit curve of the luminaires together with the limit curves. Indirect glare can be limited by eliminating shiny surfaces. If a shiny surface cannot be eliminated, indirect glare can be limited - in some cases by changing the positions of the observer, of the object or of the luminaire, or - by limiting reflected luminance. THE PROPER RATIO OF LUMINANCES The visual task is in the axis of the field of view during visual processing. The task and its closer and more distant surroundings have different luminances. These differences should correspond to certain ratios. How to meet the requirement of luminance ratios? Luminance ratios can be modified first of all by changing the ratios of the reflection factors of surfaces in the field of view. Luminance ratios are usually adequate, if - the reflection factor of the working plane is r = 0,2...0,5 and if the working plane is lighter than its surroundings, - the reflection factor of the furniture is r = 0,4...0,5 and - the reflection factors of the walls, of the ceiling and of the floor correspond to the above. EZ AZ "ABOVE" MIRE VONATKOZIK? ADATOK??? Prof. András Majoros: Artificial Lighting – www.egt.bme.hu
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