Interview with Rudi Hechfellner and Chad Stalker, Philips Lumileds Lighting

Nov 11, 2011

LEDs Review has been fortunate to meet with Rudi Hechfellner and Chad Stalker, LC from Philips Lumileds during the LEDs 2011 conference and exhibition. Both of them had presentation and session chairman duties, but have found time to answer our questions.

Rudi Hechfellner is Dir. of Applications at Philips Lumileds Lighting. Hechfellner who joined Philips Lumileds Lighting in 2005, has worked in the Semiconductor Industry for over 16 years developing innovations for technically advanced projects. Prior to joining Philips Lumileds Lighting he was applications engineer for ASIC's with focus on high speed I/O interfaces. Hechfellner holds an Electronic Engineering degree from FH Augsburg Germany. He can be reached at

J. Chad Stalker III, LC is the Regional Marketing Manager for Philips Lumileds Lighting. Mr. Stalker is responsible for working directly with fixture manufacturers, lighting designers and other market influencers to support the adoption of Solid State Lighting technologies.  He has been working in the LED lighting industry for over ten years.  Prior to joining Philips he worked in a variety of sales, marketing and technical roles with LED and lighting companies such as Luminus Devices, OSRAM and Color Kinetics.  He has been directly involved across the lighting value chain from working on new LED component solutions; to partnering with fixture manufacturers to bring LED-based lighting solutions into the market; to supporting LED lighting designs and installations worldwide. He can be reached at

LEDs Review: What do you consider one of the major challenges in the LED industry?

Chad Stalker, LC: Determining all the parts that constitute the "Quality of Light" and addressing each of them. As we discussed at the workshop today the quality of light include CCT, CRI, beam uniformity, color change over time, and color over angle. Philips Lumileds is running extensive reliability testing of our diodes usually accumulating about 700 Million LUXEON Rebel device hours of testing a year.

Rudi Hechfellner: Another challenge is educating the traditional lighting industry on what to expect from the light emitting diodes and how to utilize them in the most efficient way. There are many parts in the LED lighting fixture that determine the overall system reliability and stability over time and the diode is only one of them. Philips Lumileds is running extensive reliability testing of our diodes usually accumulating about 700 Million LUXEON Rebel device hours of testing a year to provide the highest confidence for the data we discussed in the workshop.

LEDs Review: What markets/applications do you think can be a priority for LED lighting solutions at the moment?

Rudi Hechfellner: At the moment LED lighting makes most sense for commercial applications, outdoor lighting, and in office lighting. It allows a return on investment in 3 years or less and has immediate impact on energy bills and usage

Chad Stalker, LC: We have seen a very successful model adopted by municipalities in China: the city signs contracts with the LED lighting solutions provider to replace, for example, all the street lighting with LEDs luminaries and the difference in the electricity bill goes directly to the LED lighting solution provider to repay the cost of the fixtures. We have similar pioneering agreement with the city of San Antonio where one of our customers has been installing LED street lighting luminaries and part of the difference in the energy bill now goes to repay the installation costs, and the other part can now be spent by the city on other green projects.

LEDs Review: What new and exciting applications do you anticipate for the LED lighting in the nearby future?

Rudi Hechfellner: There are many really exciting possibilities that have never been possible or even thought of before. You can imagine completely new ecosystems designed with smart services, controls and day-light harvesting mechanisms that truly improve the quality of people's life. You can already see more and more examples of the smart lighting control systems that allow people to conserve energy and also to create more safe and comfortable environments.

LEDs Review: What do you consider most important and exciting projects/products completed by Philips Lumileds this year?

Chad Stalker, LC: I think one of such projects was launch of the LUXEON S series of diodes ( They have proved to be particularly easy for the customers to adopt into their LED luminaries design. In most cases it takes about 6 month or less for the customer to get completely comfortable with this product. Also I have to say that on the way we have learned a lot on how to provide customers with the technical information they need most when designing their fixtures. For example, all LUXEON Illumination LEDs are tested at 85 degrees Celsius, not at the ambient temperature, because we know the diodes will be working at elevated temperatures and our customers need to know how they behave at that condition.

LEDs Review: At the LED Lighting Reliability workshop today there was a lot of discussion dedicated to the efficient sharing of the knowledge and experience accumulated by the LED manufacturers with the LED lighting design engineers from the customer companies. Can you name several examples of your customers who took full advantage of your knowledge and were able to improve and build on that foundation creating outstanding products? 

Rudi Hechfellner: Yes, we have been really pleased working together with Lighting Quotion. They have an excellent team and collaboration with them has been a positive experience

Chad Stalker, LC: I would also like to note GreenStar in Boerne, TX - in 18 months has developed impressive and reliable LED lighting luminaries based on LUXEON and is now being considered for the illumination of the streets at Mexico City requiring 20,000 to 30,000 streetlights. It is a very impressive result and we are glad that our support has helped them with some impressive accomplishments.

For more information please visit

Author:  Julia G.

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