In message <001f01ca7dd4$51e632e0$d600a...@tamuracorp.com>, dated Tue, 15 Dec 2009, Brian O'Connell <oconne...@tamuracorp.com> 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. Maybe they don't know. What's so special about 150 Hz, anyway? I wouldn't think you need to measure it optically; just the frequency of current through the LED would perhaps be sufficient. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK Help stamp out intolerance! - 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 <emc-p...@ieee.org> 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 <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>