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Fluorescent lights help provide extra illumination, and they come on instantly. In contrast, high-pressure sodium lights take a while to light completely. Some models feature moisture- and dust-proof covers and can either be suspended from the ceiling or mounted to the wall.
Metal halide lights are popular for overall lighting in large buildings. New pulse-start models are 20% more efficient than standard metal halide, according to the DLC. Although both types of metal halide are initially more efficient than fluorescent, their light output degrades after a few months. Depending on your lighting needs, fluorescent may be a better choice in the long run or should at least be used as part of the plan. |
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Lighting includes both artificial light sources such as lamps and natural illumination of interiors from daylight. Lighting represents a major component of energy consumption, accounting for a significant part of all energy consumed worldwide. Artificial lighting is provided today by electric lights, but previously by gas lighting, candles or oil lamps. Proper lighting can enhance task performance or aesthetics, while there can be energy wastage and adverse health effects of lighting. Indoor lighting is a form of fixture or furnishing, and a key part of interior design. Lighting can also be an intrinsic component of landscaping.
Commonly called 'light bulbs', lamps are the removable and replaceable portion of a luminaire which converts electrical energy to both visible and non-visible electromagnetic energy. Specialists who work with lighting, carefully avoid energetic units for measuring of the light output of sources of light. For example, instead of Watt per steradian, the special unit candela is used; 1 candela=(1/683) W/steradian. Common characteristics used to evaluate lamp quality include efficiency measured in lumens per watt, typical lamp life measured in hours, and Color Rendering Index on a scale of 0 to 100. Cost of replacement lamps is also an important factor in any design. |
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