high-brightness LED modules based street lighting system
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11-10-2010, 03:42 PM


Development of street lighting system-based novel high-brightness LED modules
The development of high-power light emitting diode (LED) for street lighting is a continuously evolving topic. greater energy efficiency, long operating life and light control are the major plus points of this technique. 9LEDM (9-LED module) and adaptive driver based alternative lighting system is shown here. thermal, photometric, power electronics techniques have been used to create the 9 LEDM. The 9LEDM offers a price less than 1$/Watt (W) and luminous flux higher than 110 Lumens (Lm)/W. An adaptive street lighting driver is used here which overcomes several restrictions of driving the solid-state lighting loads . It is basically a AC/DC converter of a quasi-resonant operation flyback topology and with Soft Startup, Full ON, Half ON functions by sensing the ambient light and working temperature. energy saving of more than 72% can be claimed by this technique after three months of running.

Street lighting Modules: 9LEDM
A novel 9LEDM is designed to supply basic light sources to LED street lighting array. It contains 9 HB-LEDs, 320  320  5 mm Al plate with holes in 3 by 3 arrays and a mask. a reflector cup made of copper and an
LED chip covered by phosphors is present. The reflector cup is attached to the LED chip. It is inserted into the holes then connected to pads on the Al plate by gold wire. a dramatic reduction in package thermal resistance can be achieved by the 9LEDM package.

get the report here:
filesonicfile/24228283/high-brightness LED modules based street lighting system.pdf
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