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Often task lighting refers to increasing illuminance to better accomplish a specific activity. However, the illuminance level is not the only factor governing visibility. Contrast is also important, and a poorly positioned light source may cause contrast reduction, resulting in loss of visibility. Therefore, it can be argued that the most important purpose of task lighting in the office is not increasing illuminance, but improving contrast. Because task lighting provides focused light where needed, general lighting can be reduced. Different strategies for task lighting exist. The three main approaches are: * Localized average lighting, where a lamp supplies both ambient light and task light * Freely adjustable task light such as a gooseneck, balanced-arm lamp, or swing-arm light. * Asymmetric task light, where the lamp is placed at the side of the work area There are also other approaches to task lighting, for example under-shelf luminaires. Other instances of task lighting are in machinery, where a specific work area needs illumination, and in workshops, where a task light may illuminate the actual working area. Special instances of task lighting are examination and operation lights for medicine and surgery, as well as the dentist's lamp. Task lamps are also used for many home tasks such as sewing, reading, small repairs, model construction, crafts, writing, and many other activities. The actual task may range from very small up to about as far as you may reach with your hands or available tools. Lighting of larger areas is beyond the scope of task lighting. == Task lighting == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Task lighting」の詳細全文を読む スポンサード リンク
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