Wilm, Alexander

OSRAM Opto Semiconductors, Senior Key Expert Illumination

Wilm, Alexander

OSRAM Opto Semiconductors, Senior Key Expert Illumination


Alexander Wilm is Key Expert for illumination in the SSL application engineering department at OSRAM Opto Semiconductors in Regensburg. He joined OSRAM OS in 2004 after graduating from the University of Applied Sciences in Regensburg with a diploma in Mechatronic Engineering. In his career he started with optics and system design for LED headlamps, flash lights and projectors. After being stationed in Singapore for 2 years he works as Application Engineer and Key Expert for SSL products.

Understanding and Applying the Latest Eye Safety Standards to LEDs, Modules and Luminaires

Eye Safety of light sources has always been an important point to ensure the safety of people under artificial lighting. The discussions increased especially with the introduction of the LED as a new artificial light source for general lighting. Now there are several standards and norms referring to the eye safety evaluation which is generally assessed in a measurement procedure which is defined in IEC 62471.

Since 2014 there is also a technical report IEC/TR 62778 available which describes in detail the assessment of blue light hazard for light sources and luminaires based on the IEC 62471-principles. Also other norms e.g. the IEC 62031 are referring to this technical report in order to assess and evaluate the blue light hazard of the LED module.

This IEC/TR 62778 offers much more possibilities to assess the blue light hazard in a very easy, fast and convenient way using general IEC62471 measurements and applying an assessment based on photometric and colorimetric data to provide a threshold information (threshold illuminance, threshold distance) and procedures to use component information for the assessment of the final product.

Despite the great opportunities which are provided in the IEC/TR62778 it is barely applied according to its full extend and the chance to assess the eye safety of modules and luminaires in an easy way is not seized. This paper will describe in general and in detailed examples how the IEC/TR62778 could apply the IEC62471 eye safety reports in a comprehensive and easy way in order to assess the risk groups of LED modules and luminaires in a fast and safe way.

Lessons Learned:

  • Understanding the philosophy of eye safety evaluation of light sources
  • Understanding eye safety reports according to IEC 62471 and TR 62778
  • Learn how to derive the eye safety risk group and threshold distance from the measurements of luminaires applying TR 62778
  • Learn how to determine the threshold illuminance and the threshold distance for different risk groups

All session by Wilm, Alexander

Session 3 – DAY 2 | SEPT 27

08:00 - 10:00
Conference Rooms
LpS & TiL 2018 Flyer