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.
Labels:

Comments

Post a Comment

Popular posts from this blog

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...
Post a Comment
Read more

LED lighting to reduce both power consumption

The new product is designed for use in bus & taxi stops, benches and walkway coverings and other public spaces. It is set to sell from July 20, exclusive to the Japanese market, targeting municipalities and led linear high bay light private companies. And the two manufacturers also propose its use for a wide range of applications across Japan. Its key features including:Firstly the shelter's solar power generating system can supply electricity for surrounding electrical needs, such as lighting for advertising displays, with excess power being sold to the power utility companies, thus helping to meet expected power shortages in Japan during the summer. Secondly, LED lighting to reduce both power consumption and CO2 emissions at night. Moreover, the shelter can play as emergency power supplier in the event of a disaster, as it has an independent power outlet that could be used to charge mobile phones or other vital electronics. During the several years, LED lights have gradua...
Post a Comment
Read more

although some of the monster screens had relatively narrow viewing angles

Spark new tunnel light series includes 50w, 75w, 100w, 125w, 150w, 175w, 200w, which could meet different project requirements. From the exhibition we know Spark new LED tunnel light will be more and more popular, and illluminate more and more tunnels all around the world. Consumer Reports didn't render a verdict after just a quick look, but noted that Sharp "has definitely taken the lead in larger TV screen sizes." It cited the 60-, 70- and 80-inch sets from the past, saying they had typically done well in TV ratings, although some of the monster screens had relatively narrow viewing angles. Consumer Reports pointed out a question that "not everyone has the room -- or room in the budget -- for a 90-inch set." So, when rolling out the world's biggest TV (in its class, anyway), why bother with subtlety and understatement, right?Sharp Electronics of America President John Herrington said it "offers size, picture quality and smart functionality unlike anyt...
Post a Comment
Read more