Thanks John. I'll check these references.
> -----Original Message----- > From: John Jankowski [mailto:john_jankow...@cnt.com] > Sent: Friday, July 25, 2003 8:20 AM > To: 'Richard Schumacher'; 'McBurney, Ian [Allen & Heath UK]' > Subject: RE: LED lamps > > > Richard, > > You ask a very reasonable question, and one that, as I > stated previously, has been long debated. There was concern > based on bio-hazard testing/modeling that indicated a > potential photo-thermal damage to tissue, especially in the > blue & white regions of wavelengths. I don't believe any > clear conclusion has been reached other than the laboratory > modeling. I no longer sit on the IEC TC-76 committee > regarding these issues but I have provide a few links > relating to the subject, if you wish more detail. > > You may also want to do some Web searches on International > Commission on Non-Ionizing Radiation Protection (ICNIRP). > They had championed the investigation into any threat from > LED sources. > > Have a > good weekend! > http://optics.org/articles/ole/8/6/5/1 http://www.laseroptical.co.uk/safetytraining-ledtesting.html http://cie2.nist.gov/LED%20Sympo%202001/Abstracts/David_Sliney.pdf http://cie2.nist.gov/LED%20Sympo%202001/Abstracts/Horak.pdf John A. Jankowski Computer Network Technologies 100 Mount Holly By-Pass Lumberton, NJ 08048-0440 609-518-4534 john_jankow...@cnt.com http://www.cnt.com From: Richard Schumacher [mailto:schum...@hp.com] Sent: Thursday, July 24, 2003 10:58 AM To: John Jankowski; 'McBurney, Ian [Allen & Heath UK]'; emc-p...@majordomo.ieee.org Subject: RE: LED lamps I don't work in optical standards and don't have easy access to the cited references, but from basic principles it seems a mistake to treat lasers and LEDs interchangeably. Surely the significant parameters for safety are total power, intensity, and spectrum, and not the underlying technology of the source. There are safe lasers and dangerous LEDs (and dangerous incandescent lamps, for that matter). Can someone, uhh, enlighten me about the reasoning behind the standards? From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org] On Behalf Of John Jankowski Sent: Thursday, July 24, 2003 8:02 AM To: 'McBurney, Ian [Allen & Heath UK]'; emc-p...@majordomo.ieee.org Subject: RE: LED lamps Ian, IEC 60825-1 Edition 1.2 is likely the current standard regarding safety and classification of both laser and LED products. LED's were introduced several years ago with much debate within TC76, and the two light sources are now used interchangeably within this standard. John A. Jankowski Computer Network Technologies john_jankow...@cnt.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
