Lighting Technology

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...

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 ...

LIGHTING CERTIFICATES

Choice of Lighting System The function of the room, the occupancy, and the visual tasks to be carried out there and the style of the decor will all influence the choice of the lighting system to be used. For the sake of convenience , the lighting systems employed in interiors can be divided into those having a mostly functional purpose- the primary systems and those that take over, as it were , where the functional lighting leaves off- the secondary systems. Primary Lighting Systems The most common primary lighting systems are those providing either: General Lighting Localised Lighting Local  lighting + general lighting General Lighting A general lighting system provides the required horizontal illuminance over the total area with a certain degree of uniformity. When used alone , the average illuminance should be equal to the required illuminance for the specific visual task. it is there fore widely employed in such places as large, open plan offices, work sho...

Lighting is an Art as well  as a Science. There is no ideal or optimum solution to a particular lighting problem. The design process should be seen as consisting of two quite distinct phases. Phase one begins with the client, and involves studying the various local factors that will influence the design. Phase two is the design process proper, and it is here that the first of many design decisions are made. Factors Influencing the Design It is very important that the lighting designer establishes a very good working relationship with the client and with all the others engaged in the project ( such as architects, interior designers, air conditioning engineers) at the earliest possible stage in its development. It will then often be possible to influence basic design conditions concerning the space to be lighted. Later on it might well be too late to make those changes that would have simplified or improved the final lighting design. The most important factors dictated by the...

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