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LBNL is investigating current
practices in commercial spaces relative to the use of
task and ambient lighting in a project supported by
the U.S. Department of Energy (DOE). One project activity
includes an analysis of the market place relative to
task and ambient lighting. This task has been subcontracted
to an national known lighting designer and researcher,
Naomi Miller, to give an independent evaluation of the
current technology and design practice for task and
ambient lighting systems.
While
a final report from Ms. Miller will not be publicly
available before April 2003, results from the draft
report define two distinct markets for task lights:
- portable
task lamps and
- furniture
incorporated task lamps.
The
stand-alone portable task lamps are functionally characterized
by a standard 120VAC cord and plug, and they incorporate
controls and a power supply. The furniture task lamps
are integrated into the design of the office furniture.
These luminaries generally have less spatial flexibility
and less control of the light distribution. This project
will generate new designs that will address both market
segments.
In
addition to the above research, LBNL has been performing
basic and applied research in the development of LEDs,
phosphors for LEDs, subassemblies and respective light
sources and luminaires over the last four years. The
DOE through various programs and a subcontract with
Cree Lighting has funded this work. This project builds
on experience developed in these previous efforts.
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LED
Task Light Utilizing New Materials to Reduce Thermal
Stress on High Brightness LEDs
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Key
findings and directions from this prior research include:
- The
application to task lighting offers an immediate opportunity
of introducing solid state light sources and providing
end-user benefits in energy efficiency and optical
properties not achievable with current sources.
- The
relationship of LED device performance to the thermal
characteristics of the device is crucial. The LED
performance can be increased through improved thermal
management of the die temperatures.
- Further
improvements in LED performance can be achieved with
improved die processing, phosphors and micro-optics.
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