On 24 July 2007, the EN Division organized
a seminar called ¡§Driving High Brightness LEDs¡¨.
The guest speaker Mr. Kelvin Tsiang, Marketing
Manager, On Semiconductor gave an overview on
the development and application of LED in lighting.
The speaker opened the talk by providing an overview
of the LEDs and Solid State Lighting. Kelvin explained
that the common ¡¥white LED¡¦ is a blue emitting
LED coated with a phosphor, emitting yellow light
when excited. Based on the research report, in
2006, the solid state lighting market is over
7 billion USD worldwide with a yearly increase
by 20 %, estimating total 50 ~ 100 billion USD
for coming 5 ~ 10 year. Estimated by the International
Energy Agency is that for 2005 there were 1900
Mt of CO2 emitted globally for lighting which
is equivalent to 70 % of light passenger car emissions.
Lighting technology based on LEDs will offer
a great potential to create new and exciting products
and reduce global energy impact of lighting. There
are example such as exit signs, traffic control,
signage, torch lights, notebook backlighting.
As opposed to traditional lightning, LEDs are
inherently low voltage devices and require current
drive for optimum performance. Based on a study
for the total expense for 50k hours of home lighting
using Incandescent (25W), CFL (5W) and While LED
(3W), the expense for the LED is only 30 % to
that of the traditional Incandescent Lamp. To
illustrate, the average life of Incandescent is
1,500 hours while the LED is 50,000 hours. Furthermore,
energy consumed by the Incandescent is 1,250 kwh
as opposed to the LED which is 250 kwh. Kelvin
also pointed out that the solid state lighting
requires a system solution, i.e., LED Source,
Power Conversion, Control and Drive, Thermal Management,
Optics.
The talk ended with an interactive Q&A and
a souvenir is presented to Ir P F Tsui, Chairman
of Electronic Division.
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