Skip to main content

the results already gained in the field of short duration LED applications

Strauss introduce that the green source in a pico-projector producing a 100 lumen brightness must meet the requirements as following: an emission wavelength of 515 nm; an output power of at least led linear high bay light; a wall plug efficiency of 5 percent or more; and, in both the lateral and vertical directions, a single mode output. If a shorter wavelength source is used – for example, a 505 nm laser – the power output requirements are higher.

In close collaboration with the Fraunhofer Institute for Reliability and Microintegration (IZM) Heraeus has continued to work on the design optimization of its SCB substrates for LEDs. Quite apart from the results already gained in the field of short duration LED applications, the focus this time was put on applications of a longer duration. The aim now was to lower the junction temperature TJ of the applied LED chips and so enable a direct readout relating to the overall effectiveness of the thermal management in comparison to other substrate solutions. (The junction temperature is the temperature which arises in the barrier layer and thus its relevance to the ageing process of the semiconductor).

The theoretical FEM simulation had already prescribed at which parameters the junction temperature could be lowered by several degrees Celsius. Armed with this data, together with best practice approaches and optimum simulation results, the engineers laid down the sample substrate and assembled it in line with the predefined design.

The subsequent (de facto) thermal analysis of the led high bay light at the IZM proved that thanks to the optimized choice of material and the simultaneously defined and perfected design the TJ sank by as much as 12 °C in comparison to standard designs for short duration applications when operating under an electrical load of 1.5 W.  This drop in temperature has an extremely positive effect on the durability and brightness of the HBLED.

Comments

Popular posts from this blog

LED recessed downlighting options for general lighting in commercial

Cooper Lighting, a division of Cooper Industries plc (NYSE: CBE), has expanded its Halo LED H7 Collection offering additional choices in LED color temperatures and higher lumen options. The 6” LED downlight product line expansion–from the original Halo LED 600 Series–now includes the Halo LED 900 Series and Halo LED 1200 Series, offering a wide and versatile selection of energy-efficient LED recessed downlighting options for general lighting in commercial, retail, institutional and residential applications. Designed for new construction projects or to retrofit existing 6” nominal compatible housings (with an Edison screw base adapter included with the module), the Halo LED H7 Collection features excellent color rendering (80 CRI) and offers the industry’s widest selection of color temperatures (2700K, 3000K, 3500K and 4000K). The superior optical design yields productive beam lumens providing smooth, even illumination, excellent cutoff and extremely low glare. Consuming less than 15W, ...

We are confident that he will do the same at Lighting Science

We are delighted to have Jeremy join the Lighting Science team," said Nic Brathwaite, Chairman of the Lighting Science Board of Directors. "Jeremy is a proven strategic thinker, inspiring leader, and brand builder who has successfully introduced major innovations at some of the world's best known companies, resulting in accelerated sales volume, profit and market share growth. We are confident that he will do the same at Lighting Science." "This is an exciting time to join the talented team at Lighting Science, as consumers, businesses, municipalities, and governments worldwide are poised to move into the digital light age," commented Cage. "I intend to accelerate growth by building on the company's core competencies of excellence in innovation and strong and differentiated brand development. We will focus on unleashing the science of light and sustainable technologies to markets ranging from major cities, commercial centers, factories and retailer...

while all of hit new record quarterly highs

As a result, to increase greenhouse yields and decrease producers' energy costs, they will team up with Rutgers University, the University of Arizona, Michigan State University, and Orbital Technologies Corp. on the four-year project to improve and evaluate LED lighting for greenhouse use, according to Cary Mitchell, a professor of horticulture and project director for the grant. Total sales from January through September of 2010 hit NT$92.88 billion, up 35% YoY. Meanwhile, operating profit and net profit reached NT$5.67 billion and NT$6.8 billion respectively, with accumulated EPS of NT$3.05 increasing a remarkable 50% YoY. In 3Q10, The Company’s gross margin and operating margin reached 13.9% and 6.7%, up 0.9% and 0.4% QoQ, respectively. Lite-On’s net cash position held steady at NT$11.9 billion, after its recent cash dividend distribution of NT$5 billion. Non-operating items posted a net income of NT$508 million in3Q, with Perlos’ Q3 sales reaching €138 million, up 12% YoY. Perl...