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How to Address the Lighting Challenges of High-Brightness LEDs

By David Hoskins, Cypress Semiconductor Corp. San Jose, CA Two overriding issues should be considered when driving high-brightness (HB) LEDs. The first is to ensure that a fairly constant current is available with minimal variation, since a fluctuation in current can cause an apparent change in brightness. The LED having a nonlinear response to current can exacerbate this. The second issue is to control the temperature of the LED. Temperature affects the brightness and longevity of an LED, so it is important that lighting systems enable heat to be effectively dissipated to control LED temperature. In addition, it may be necessary to monitor temperature and reduce the current through the LED. This has the effect of lowering its temperature and optimizing light output, efficiency, and longevity.

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LED Power Module

The PIL300U-V Series LED power modules from Power Partners, Hudson, MA, provide 300W of output power from a 90-305VAC input range. The PIL300U-V design incorporates high PFC, meeting the requirements for EN61000-3-2. Standard output volt ages range from 12VDC to 150VDC. Exceptionally efficient, ratings are up to 94%, and the specified operating temperature range is –35°C to +70°C. The PIL300U-V Series LED power modules are housed in a compact and rugged aluminum enclosure and rated to IP67 waterproof standards, making them suitable for harsh environments in industrial or commercial indoor/outdoor lighting applications. www.powerpartners-inc.com

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UV LED Spot Curing System

EXFO's Life Sciences & Industrial Division, Mississauga, ON, Canada, introduces the OmniCure® LX400 UV LED Spot Curing System. The system is able to control up to four UV LED heads simultaneously with a single connection or independently. UV LED heads are available in three different wavelengths (365nm, 385nm, and 400nm) for greater compatibility with current adhesives. Each head can be set for different exposure times and irradiance levels in 1% increments. The system is ideal for UV spot curing assembly processes used in manufacturing optical communication, lenses, DVDs, and electronic equipment. www.EXFO-OmniCure.com

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Light-Measurement System

The Jaz™ Modular Measuring Suite from Ocean Optics, Dunedin, FL, is now available for radiometric analysis of LEDs, flat panel displays, lamps, and other radiant sources. The Jaz Light Meter is a pre-configured, pre-calibrated spectrometer suite that is ideal for quality control, lab and field measurements of LED chips, assemblies, and other luminaires. Spectral characteristics can be measured, and key parameters like Lux, Lumen, PAR, and Watt values can be calculated. The battery module enables measurement for up to 8 hours, without recharging, and Jaz’s SD card slot offers a convenient way to store spectral data. Jaz’s data can be downloaded into SpectraSuite for post-processing and determining CIE color coordinates, color rendering indexes, and color temperature. www.oceanoptics.com

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OLED Panel

The ORBEOS panel from OSRAM Opto Semi con ductors, San Jose, CA, has a round lamp surface of 80mm diameter, is 2.1mm thick, and weighs 24g. With an efficiency of 25lm/W, the panel beats that of conventional halogen lamps. Its warm white color temperature (2,800K, CRI up to 80) matches the warm light of an incandescent lamp, and is therefore suited to lighting that is atmospheric and functional at the same time. ORBEOS can be switched on and off without delay and is continuously dimmable. The panel contains no mercury and emits no UV or infrared radiation. Its brightness level is usually 1,000cd/m² with power input of less than a watt. In ideal operating conditions it has a lifespan of around 5,000 hours. www.osram-os.com

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UV LEDs

QuasarBrite™ UV LEDs from Lumex, Palatine, IL, are available in 385nm, 405nm, and 415nm wavelengths at 4-6mW in through-hole format. A robust TO-46 package with a glass lens provides a lifespan of more than 50,000 hours. QuasarBrite UV LEDs provide a uniform beam pattern and do not use the hazardous mercury material found in CCFL technology. Lumex’s UV LEDs have up to 70% lower energy consumption than CCFLs. The UV LEDs are ideal for a wide range of applications, such as bacterial and superficial sterilization for medical device technologies; industrial control device technology related to leak and biohazard detection; forensic applications related to counterfeit detection; and ink fluorescing. www.lumex.com

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High-Output Red LEDs

Opto Diode, Newbury Park, CA, offers the OD- 624L High-Output Red LED with a dominant emission wavelength at 624 nm (typical) and a narrow beam angle that is ideal for fluorescence in medical, scientific testing instruments, and forensic applications. The lighting device delivers total power output ranging from 80 mW (minimum) to 170 mW (typical). The high-output red LED comes in a hermetically sealed TO-5 can with three leads. Under absolute maximum ratings at 25°C, the continuous forward current is 500 mA, with reverse voltage of 10V. The lead soldering temperature is 260°C, making the LED easy and convenient to install into new and/or existing lighting systems. www.optodiode.com

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