Ordinary LEDs respond somewhere in the 50 nanosecond time range. With that kind of bandwidth there is no danger of optical smoothing below 10 MHz, thus the choice between measuring electrons or photons at 150 Hz is moot. Is there an exception to the 150 Hz lower limit, or is the use of 0 Hz now banned?
Meanwhile, someone at the DOE is probably writing a proposal to form a committee to commission a study to propose a recommendation for the answer to your question. Orin Laney In message <[email protected]>, dated Tue, 15 Dec 2009, Brian O'Connell <[email protected]> writes: >The "LED Operating Frequency" requirement, released 03Dec2009, is at >least 150Hz. > >Is this frequency measured at the LED power source or is it measured as >a flicker in the LED's visible wavelength emissions ? > >Nobody at the DoE likes me enough to reply. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
