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With the development of the super bright white LED's, the conventional lighting system may soon to be near extinction. LED's have several advantages over conventional incandescent lamps. For one thing, they do not have a filament that will burn out, so they last much longer. Additionally, their small plastic bulb shield makes them a lot more durable.  But the main advantage is efficiency. In conventional incandescent bulbs, the light-production process involves generating a lot of heat (the filament must be warmed). This is completely wasted energy, because a huge portion of the available electricity goes toward generating heat rather than going toward producing visible light. LED's generate very little heat, relatively speaking. A much higher percentage of the electrical power is going directly to generating light, which cuts down on the electricity demands considerably.  These attractive advantages have made LED's to be suitable as general lighting means and for special lighting needs.  As part of this effort, KINGWELL is a leader in delivering lighting solutions by leveraging technological breakthroughs in the semiconductor industry.

LED Basics

A basic LED consists of a semiconductor diode chip mounted in the reflector cup of a lead frame that is connected to electrical (wire bond) wires, then encased in a solid epoxy lens. LED's emit light when energy levels change in the semiconductor diode. This shift in energy generates photons, some of which are emitted as light. The specific wavelength of the light depends on the difference in energy levels as well as the type of semiconductor material used to form the LED chip. LEDs are color-controlled monochromatic, narrow bandwidth lux producing devices. Depending on how the LED chip is packaged determines the beam (narrow or wide) angle. Things that effect the beam angles are: shape of the reflector cup, size of the LED chip, epoxy lens shape, and the distance between the LED chip and the top of the epoxy lens.



Xenon is a rare gas with certain properties that made it to be an excellent medium for lighting purposes: In dense enough quantities, xenon will conduct electricity. As a conductor, it glows very brightly. It will continue to provide bright illumination for a substantial amount of time (2,000 to 6,000 hours). Constructing a xenon bulb is a tricky process. The bulbs have a quartz envelope instead of a glass one because the bulbs become extremely hot when lit. The quartz shell houses a cathode and an anode. Since the xenon gas itself is conductive, a filament is not needed. Instead, when a current is applied to the bulb, the charge arcs between the cathode and anode. For the bulb to shine brightly enough, the xenon must be pure and the quartz envelope must be vacuum sealed.





Kingwell Products Inc.

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Linkou, Taipei 24441

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Last Updated: 04/02/2003