"Recommending practices for
modulating current in High Brightness LEDs for mitigating health risks
to viewers"
History:
Officially sanctioned by IEEE (Power
Electronics Standards Association) in October 2008, the process for
forming a working group began 9 months earlier. Working with standards
associations within NEMA, CIE, IEC, and EnergyStar, it was realized
that many LED lamp manufacturers and LED driver manufacturers are
concerned with making sure they are driving LED lamps at safe
modulating frequencies. But, there is confusion as to what these
frequencies are for different LED applications. Standards Chair, Brad
Lehman, began to contact leading experts/researchers in LED lamp
design, lighting environmental psychologists, health experts, LED
driver designers and organized the working group. The group will
publish recommended practices in IEEE. The report will also be
submitted to appropriate CIE, IEC, EnergyStar and NEMA standards
groups, who have representation/liasons in the IEEE working group as
well.
Status:
Several draft subcommittee reports
have been written on specific topics that include photosensitive
epiliepsy, definitions, methods for driving LEDs. These will eventually
be merged into one document. There has been extensive research
and writing on the causes and effects of flicker in LED lighting. We
are beginning to prepare some recommendations on flicker and best
design practices. Prior to any vote, the reports will be open to the public for
their comments. (February 2010)
