LED lighting searching for balance between efficacy and efficiency
September 29, 2011 // Christoph Hammerschmidt
There are many challenges for the fledgling LED lighting industry - but the chanced far outweigh limiting factors, several speakers at the LED Lighting Symposium LpS in Bregenz said. The challenges vary depending on the position of the respective speaker in the value chain.
One of the major challenges for the LED lighting industry is that the value chain currently is undergoing a reorganization process. Luminary manufactures need to acquire a number of new competencies, said Gerhard Kuhn, head of Osram Semiconductor's application team. "Luminary vendors need to add competencies in thermal management, electrical design and standards handling", he said in his keynote speech at the LpS. "A bad optical or thermal design or a poor driver can dramatically decrease the design of a LED lamp," Kuhn noted. As a consequence, the efficiency needs to be regarded not as a topic of the LED module alone, but of the entire product. "Efficiency needs to be optimized along the entire value chain", Kuhn demanded.
With LED lighting applications being field a wide open field where the designer's creativity can find ample chances to unfold, the differentiation at the market will be done by a new set of product features: Reliability, LED properties and power consumption, Kuhn predicted.
On a technical level, the indoor lighting application market is determined by the conflict between CCT (Correlated Color Temperature) versus CRI (Color Rendering Index). LED designers have to find the right trade-off between light quality and efficiency, between efficacy and efficiency.
In outdoor illumination applications, other factors are more in the foreground. In the first place, energy saving is the predominant driver for LED lighting success. But factors such as service lifetime, reliability and stability should not be underestimated either, Kuhn said. Reliability, in turn, is determined in the designers ability to master the influence of temperature, humidity and corrosive gases - after all, outdoor lighting in most cases is street lighting and as such exposed to the exhaust gases from cars. he provided an example, how this considerations influence LED lighting designers: "Silver corrodes very fast under these conditions, so designers should make sure they don't use silver in the reflectors of outdoor LEDs," Kuhn explained.
In this context, there are however many parameters for LED semiconductor vendors to optimize their products. It also becomes visible that there are cultural gaps to close along the value chain. "We can help luminary manufacturers to establish more expertise", Kuhn promised. "We try to learn their language."All news
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Internet of Things (IoT) manufacturer Ciseco has launched the Raspberry Pi ‘Wireless Inventors Kit’ (RasWIK), featuring 88 pieces to provide everything a Pi owner needs to follow a series of step-by-step projects or to create their own wireless devices, without the need for configuration or even writing code.
RasWIK has been designed to be highly accessible, demystifying the dark art of wireless and enabling anyone with basic computing skills to begin building wireless devices with a Raspberry Pi. You can create anything from a simple traffic light, to a battery monitor, or even a temperature gauge that sends data to the Xively IoT cloud so billions can access the data.This month, Ciseco is giving away twelve Raspberry Pi Wireless Inventors kits, worth £49.99 each for EETimes Europe's readers to win.
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In our previous reader offer, Farsens was giving away five kits for EEtimes Europe readers to evaluate its FenixVortex, Kineo and X1 wireless, battery free sensor tags.
Lucky winners include Mr A. Neil from the UK, Mr. E. Delvaux from Belgium, Mr Lengal from the Czech Republic, Mr H. Bijlsma from the Netherlands, and Mr G. Pfaff from Germany. All should be receiving their packages soon. Lets wish them some interesting findings with their projects.
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