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Illuminance ranges for Indoor Activities/Areas

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The illuminance recommended for a specific type of activity will depend partly on the nature of that activity(principally its visual difficulty) and partly on the design of the interior concerned (particularly the lightness of the surroundings). The table below gives recommended illuminance , based on the scale defined above, for different areas and activities. The values given are average maintained illuminance over the task area. There fore the illuminance may not fall below these values, no matter what the age of the installation. The values are valid for normal visual conditions and take into account the following factors: - requirements for visual tasks -safety -psycho-physiological aspects such as visual comfort and well being -economy -practical experience The illuminance should be increased, when: -unusually low reflectances and /or contrasts are present for the task -visual work is critical -errors are costly to rectify -accuracy or higher productivity is of ...
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Types Of Lighting Controls

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Lighting Controls At the nerve center of a lighting system are the controls,which manipulate the level of illumination in each space and provide flexibility in those spaces used for variety of functions. Controls are the only part of the lighting system that the user is able to touch so should be easily adjustable.Lighting controls can aid in managing and limiting the energy consumption in a space, while still providing the individual user flexible light levels in multiple use spaces. There are five basic strategies to save energy, enhance performance and offer convenient  light level changes, they are Occupancy sensing Scheduling Daylight Dimming Tuning Preset dimming Occupancy sensing and scheduling are means of limiting the hours of lighting to the hours of occupancy. Daylight dimming aims to dim electrical light as available daylight enters a space to achieve a constant light level.Tuning and preset dimming allow the user to change light levels for spe...
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Light Color and Color Rendering

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True Colors do not exist. People tend to judge colors under what they consider to be natural or true lighting conditions, often  mistakenly using daylight for this purpose. but the colors seen under daylight on a Sunny day can be widely different to those seen on a day with overcast sky. For the spectral distribution of daylight is not constant, but is continually changing from hour to hour and from season to season. The correct thing to do, of course , is to assess the colors under the same type of lighting as that existing in the area where they will be finally seen. For example, an evening dress would be chosen under incandescent lighting, for this is the sort of lighting most likely to be employed at the evening function where it will be worn. Similarly, the color scheme for an office should be preferably be chosen under lighting identical to that which will later be installed there. Image Courtesy Philips Spectral Distribution The spectral distribution of the light de...
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