Perennial issues


The most current can be found in the "History" at the bottom of this page.

 There are also all links to the downloads.


CFD software:
If you meet the hardware requirements, you can request the CFD calculation software here.


"Driverless LED ...":

Not as big as it sounds: One has to be aware that LEDs without drivers operated directly to alternating voltage will flicker with it's maximum or stroboscope-like.

According to DIN EN 12464-1 / -2, stroboscopic flicker must be avoided at workplaces.

According to the new Eco Design directive the amount of flicker of these lamps will not be allowed in future any more.
You should in any case obtain information about the light flicker from your vendor.


Fraudulent competition?
The assertion of flicker-free can not be correct for illuminants that flicker more than the incandescent bulb. Here is the list of marketers who still do.



At the symposium 2018 Der Lichtpeter appeared as a speaker with the topic:
"Light flicker: Reasonable measurements in view"
There, the CFD and TLA were argued as leftover meaningful measurement methods.


You were able to contact directly at

booth A8 at Dietmar Müth Messsysteme




On 16./17. In April, a working meeting of the International Electrotechnical Commission IEC TC34 WG5 took place in the Osram-Lighthouse, Munich, which was scheduled for 30 members from 13 nations. Der Lichtpeter was also invited to this meeting and presented the CFD and the TLA as a combination of PstLM and SVM. The top experts of this round agreed: Technically, the procedures are flawless and well worked out.


On 11-Nov-2017 at 5:00pm there was a  radio show on Radio Querfunk Karlsruhe 104,8 MHz about light and light flicker. The whole cast oder only the conversation part may be downloaded.


15-Nov-2017: On the  Website Open Forum in EuP Network Germany there is to read:
"Product properties: Light flicker: Discussion text by Peter Erwin".


Since June Marcel van der Steen has used the

CFD as a measure of light flicker. Thus in his professional light measuring laboratory OliNo lamps and illuminants are not only measured with regard to the light flicker but also assessed meaningfully.


In the latest issue of the US LEDs Magazine, an article has been published in which Peter Shackle

and Der Lichtpeter present the CFD as the only suitable measurement for complex periodic light signals.

History (but always at present)


 Last update of this homepage: 12-Nov-2021:

- 16-Sep-2021: Admission as an expert at LiTG.

- 09-Mar-2021: Expert discussion at the Federal Office for Radiation Protection, Munich.

- 29-Oct-2020; 19:00 : LiTG-Web seminar: »Light Flicker«
- 22- Oct-20: Advisory group meeting at BAM in Berlin: Changes to EU Regulation 2020/2019

- 03-Oct-20: Podcast: luxlumina (DE) 10/20 / # 06: Human Centric Lighting. Listen here.
- 03-Sep-2020: Podcast: luxlumina (DE) 09/20/#05: Light management and flicker. Listen here.

- Mar 20: Article in LED professional LpR78: New directive EU2019/2020.   Download here.

- 10-Feb-2020: In the testlist now about 1300 products in DIY stores and online shops.

- Sep 19: Article in luxlumina (DE): LED-Flicker and no end?   Download here.

- 13-Mar-2019: In the testlist now about 1200 products in DIY stores and online shops.

- 03-Nov-2018: Entry at the European Commission for SVM limit value = 1.0

- 27-Sep-2018: Successfull speech at the symposium LpS 2018.

- 21-Aug-2018: Advisory Board Meeting at BAM in Berlin for the new Ecodesign Directive.

- 13-Aug-2018: Member of the International Commission on Illumination research forum RF-02.

- 15-Jun-2018: Natur-nah assesses its products with the CFD.

- 01-Jun-2018: Submission of conference proceedings for the speech at LpS 2018.

- 01-May-2018: Proposal by IEC: TC 34 / WG 5 to be an additional associate.

- 16-Apr-2018: Active participation in the working meeting of WG 5 of the IEC : TC34 in Munich.

- 25-Mar-2018: More than 250 illuminants reviewed on Amazon (DE).

- 22-Feb-2018: Interview with the magazine LiCHT, Munich: Lightflicker (DE).    Download here.

- 12-Feb-2018: LiTG: Lecture "Flicker on light sources" at KIT Karlsruhe (DE).

 - 08-Feb-2018: The ALDI-Süd special offer of the week (DE).

 - 01-Jan-2018: In the testlist now more than 1000 products in DIY stores and online shops.

- 21-Nov-2017: Advisory Board Meeting at BAM in Berlin for the new Ecodesign Directive.

- 15-Nov-2017: EuP Network Germany : Light flicker: Discussion text by Peter Erwin.

- 11-Nov-2017: Radio show on Radio Querfunk Karlsruhe 104,8 MHz about light and light flicker.

- 06-Nov-2017: greenandco assesses its products with the Dimming Profile DPA.

- 29-Sep-2017: Delivery of the first CFD measuring instrument to TÜV SÜD.

- 26-Sep-2017: Visit of LpS 2017, further deepening of contacts and mediation of the CFD.

- 15-Aug-2017: In the testlist now more than 900 products in DIY stores and online shops.

- 10-Jul-2017: More than 150 illuminants reviewed on Amazon (DE).

- 01-Jun-2017: The measuring laboratory OliNo assesses lamps and illuminants with the CFD.

- 20-May-2017: Renewal of these websites by Hanna Wagner, Onlinemanagement für KMU

- 12-Apr-2017: In the testlist now more than 800 products in DIY stores and online shops.

- 02-Apr-2017: Article: LEDs Magazine: With Peter Shackle: Understand a new flicker metric...

- 21-Mar-2017: KEK practical seminar: Innovative lighting systems (DE)

- 01-Mar-2017: Sebson assesses its products with the CFD.

- 13-Feb-2017: Now as an online article: Lightflicker: Cause and correct measurement (DE)

- 13-Feb-2017: WDR5, Leonardo Interview at 1h:08 of the radio broadcast: Flicker (DE)

- 13-Feb-2017: The ALDI-Süd special offer of the week (DE).

- 05-Jan-2017: The Dimming Profile expresses the behavior of the dimmer in a simple measure.

- 31-Dec-2016: Too bad that Wolfgang Messer closes his blog, it is

    a loss of a very valuable, praiseworthy, great work.

- 15-Nov-2016: Patona assesses its first product with the CFD.

- 03-Nov-2016: Over 700 test results: the driverless are striking.

- In the March 2016 issue of the electronics journal published by

   the author Hans Diesing in this article sees the CFD as the basis of a
   marking in the technical data of illuminants (DE).

- 08-Jan-2016: greenandco assesses its products with the CFD (DE).

- 14-Dec-2015: An interview with Prediger-Lichtjournal from Hamburg:

   Lightflicker: Why the electronic ballast is so important. (DE)