Great information. Thanks. How do you deal with the certification process? Do you go through CDRH or any other agency like UL? U.S. Department of Health and Human Services Public Health Service Food and Drug Administration Center for Devices and Radiological Health Rockville, Maryland 20857 Regards, Xiaofan -----Original Message----- From: Mike Hord Sent: Thursday, July 14, 2005 6:00 AM With an emphasis on LEDs and laser diodes. http://www.icnirp.de/documents/led.pdf Came about while investigating safety implications of IR based eyelid motion detectors. Mike H. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist