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JINLING Chen
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KIM Chen
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Subject: AUTOMOTIVE LED
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2009-10-06 |
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| What makes
LEDs different from other light sources?
LEDs are semiconductor devices, while incandescent, fluorescent, and
high-intensity discharge (HID) lamps are all based on glass enclosures
containing a filament or electrodes, with fill gases and coatings of
various types.
LED lighting starts with a tiny chip (most commonly about 1 mm2)
comprising layers of semi-conducting material. LED packages may contain
just one chip or multiple chips, mounted on heat-conducting material
and usually enclosed in a lens or encapsulant. The resulting device,
typically around 7 to 9 mm on a side, can produce 30 to 150 lumens
each, and can be used separately or in arrays. LED devices are mounted
on a circuit board and attached to a lighting fixture, architectural
structure, or even a "light bulb" package.
General illumination applications that may most benefit from the LED
attributes described in this section including the following:
Undercabinet lighting In-cabinet accent lighting Adjustable task
lighting Refrigerated case lighting Outdoor area lighting Elevator
lighting Recessed downlights Accent lights Step and path lighting Cove
lighting Spaces with occupancy sensors Food preparation areas Retail
display cases Art display lighting
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