Lighting. Wednesday , September 27th , 2017 - 14:19:32 PM
4.) Downlights are ceiling fixtures which project light downward, as their name implies. There are two types of Downlights - Recessed downlights and Surface Mounted downlights. Recessed downlights are fitted into a space inside the ceiling, also called High Hats. Some High Hats direct light towards the wall and these fixtures are called wall washers. Wall washers are usually used to light objects on or along the wall such as paintings, tapestries, bookcases, draperies and other window treatments. Another type of downlight, which is a very specialized type of a ceiling fixture, is the Focusing Lens Projector. This is specially used to highlight paintings, sculpture, vases or other works of art. You have a choice between either floodlamps or spotlamps with your recessed downlights. While a floodlamp casts a broad beam, a spotlamp casts a narrow beam of light. Surface Mounted Downlights are easier to install than recessed mounted downlights since no cutting of the ceiling is required. Surface mounted downlights do not disappear into the ceiling. Matching the color of the surface mounted downlights with the color of the ceiling will achieve a unified look.
From the force in the same time to do the power of the number of the introduction of the concept of electric power, the current work fast, electric power is large; current work slow, electric power is small, or in the same time, the more power to do more power, On the LED, not the greater the power, the higher the brightness of the product. To the United States and the United States electronic light red LED, for example, axial brightness of 1200mcd, the current is 40ma, power 0.48W; three lights white LED at the same brightness, the current is 18ma, power is only 0.24W; The power of the two kinds of light at the same brightness is different. So when we buy LED to pay attention to its axial brightness, rather than power.
LED lightingmanufacturers expect LED life to reach 100,000 hours MTBF (The average time between failures, the standard used by traditional lighting manufacturers to measure the life of the light source). But, like all basic light sources, like LED The luminous flux also fades with time. So although the LED light-emitting time can be very long, MTBF is not the only consideration to determine the service life. The attenuation of LED lumens is affected by many environmental conditions such as ambient temperature, humidity and ventilation. Lumen fading is also affected by control, thermal management, current levels and many other electrical design considerations (cited above for US CK).
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