Ta Dah, welcome to first public emission of my automated mail response system (done in Python, of course). Now back to my regularly scheduled drivel.
My employer produced several power supplies for the LED-based traffic signals and public lighting (about 6 years ago). And they met temperature, shock, vibration, EMC, and NEC requirements for use from Nome to Namibia. And our reward for this early innovation was to have the design 're-invented' on another continent. But today my employer's non-customers have one small problem, they modified component selection such that the design no longer meets EMC or temperature specs. Hah ! Lessons That I Learned From This Project: 1. No good deed goes unpunished 2. The 'green' industry is full of scams, and under-funded, half-witted start-up companies. 3. The 'net' Carbon foot-print resultant is not always positive for all lo-power technologies. 4. The bottom-line drivers cannot afford to, and will not reward the most safe, nor the most reliable, nor the most efficient, nor the least RF emissive. And there is no IEC standard that can fix this. Luckily, absolutely none of this is my employer's opinion. Brian > If they are like the LED traffic lights in Olympia, WA, they are > NOISEY!!! Especially in the AM broadcast band. > > Ghery Pettit > How are LED lamps driven (in this application)? I though > switch-mode > regulators were used. > If so, I wonder what the potential for EMI will be? > > I guess it can't get much worse, now that Broadband over > Power Lines (BPL) > is used in the U.S. > > Pat Lawler > EMC/Reliability Engineer > SL Power Electronics Corp. > > [email protected] wrote on 10/19/2007 08:01:28 AM: > > ... at least, in downtown Ann Arbor Michigan. > > General lighting applications have been a long sought > application for > > the LED industry and, while they may not make for a good > reading lamp, > > I'll be interested in seeing how this trial goes (and how many > > bandwagoners jump on-board, before the two-year trial's results are > > out). The article states that ROI is at break-even after > four years for > > 10 year projected lifetime for the lamps. > > http://www.foxnews.com/story/0,2933,303258,00.html > > > > Regards, > > Peter L. Tarver, PE - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This e-mail has been scanned by MCI Managed Email Content Service, using Skeptic(tm) technology powered by MessageLabs. For more information on MCI's Managed Email Content Service, visit http://www.mci.com. ______________________________________________________________________
