Lighting glare is what little knowledge |? - China lighting network

Because of the brightness distribution or brightness range is not appropriate, or extreme brightness contrast, so that cause uncomfortable feeling or reduce the ability to observe details or target visual phenomena, known collectively as glare. If eye contact to glare, will feel excitement and nervous, long time work under this condition, can produce bored, restless and fatigue, have a big impact on people's production and life. Glare press for visual impact, can be divided into discomfort glare and disability glare. （ 1) Discomfort glare visual discomfort, only can create the effect of distraction, but in a short period of time does not necessarily reduce the visibility of the visual object, such as glare called discomfort glare. ( 2) Disability glare due to the position of the light source close to the line of sight, in the retinal image edge blur, which interferes with the observation of the surrounding objects, reduce the visibility of the visual object, if the lateral inhibition, it also makes for the visibility of the object becomes worse, such a glare disability glare. Glare according to the mechanism of the formation is divided into four types of glare of direct and indirect glare, reflected glare and contrast glare. ( 1) Direct glare direct dizzy just looking at objects exist within or near the line of sight direction in the direction of the light generated by the glare. In building environment, through the glass of sunlight, luminous ceiling and lamps and lanterns of light source, when the light too bright, can produce direct glare. ( 2) Glare of indirect and direct glare, there is a high brightness of the light source in the field of vision, but not in the direction of the observed objects, then the glare caused it is indirect glare. ( 3) Reflected glare caused by reflection of glare, especially near the line of sight direction saw the reflected glare. According to the number of reflection and formation mechanism of glare, reflected glare can be divided into a reflected glare, secondary reflected glare and light curtain reflection. A reflection refers to the strong light is projected onto the view objects, because of the target surface gloss reflection and formation of the phenomenon of mirror reflection and diffuse phenomenon of mirror reflection. For example, to hang a mirror in the wall opposite the window, when the sunlight from the window into our observation of the things in the picture frame can produce light, the light spot is actually like a side window. Second the brightness of the reflected light is when the human body or other objects above the surface of an object viewed brightness, and their yao reflection image right into the line of sight of people, then the human eye can see on the surface of the object or objects reflected image, thus unable to see the target object. When standing in a glass display case, for example, wants to see the exhibit is see, this kind of phenomenon is the second reflected glare. Light reflection is visual object mirror reflection, it makes the contrast of visual object is reduced, so that some or all of the harder to see objects in detail. For example, when the light irradiation on the surface of the files that use glossy paper printing, most of the light reflection to the viewer's eye inside, if the word of the article is black, but also reflected in the viewer's eyes, there will be light reflection, make the viewer couldn't see the words clearly. ( 4) Contrast glare to make people feel uncomfortable is not only the light stimulus, the cause of environmental brightness also plays a role. Environmental brightness and the difference between the light source intensity, the greater the brightness contrast, contrast glare the easier it is to form. For example, a lit lamps, pedestrians won't notice it's there during the day; And the night, pedestrians feel street light was dazzling. Because the night background brightness is very low, and the street light is very bright, formed a strong contrast glare. YanZhiXiang

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