Hi Moshe:
> Can someone enlighten me on the status of safety of using LED's as > indicators. Are they still > to be suspected as radiation sources (60825) and what should I do in the > design (?) to prove > them safe? EN 60950 Amd 11 invokes EN 60825. EN 60825 applies to ALL lasers and LEDs. EN 60825 establishes emission classes and safeguards for each class. The indicator LEDs I have in my products are Class I. As such, no safeguards are required, including labelling. However, it is necessary to DECLARE Class I emissions. As a general rule, indicator LEDs are taken as Class I without test. This is similar to accepting a 1.5-volt battery as low voltage without test. However, I don't have any test data to prove the indicator LED is Class I if I were to be challenged. I do ask the LED manufacturer for his declaration that his LED is Class I under maximum current (since emissions are measured with the single worst-case fault introduced into the equipment). Most LED manufacturers are not aware that EN 60825-1 applies also to non-lasing LEDs. They have no experience in testing to EN 60825-1, and often make major mistakes in their testing and calculations. Most LED manufacturers are happy to test at rated current, but are reluctant to test at anything above rated current as such operation is outside of specs. They don't understand that safety must be maintained even with the worst-case single fault. Fortunately, most indicator LEDs self-destruct before they exceed Class I emission. Best regards, Rich ------------------------------------------------------------- Richard Nute Product Safety Engineer Hewlett-Packard Company Product Regulations Group AiO Division Tel : +1 619 655 3329 16399 West Bernardo Drive FAX : +1 619 655 4979 San Diego, California 92127 e-mail: ri...@sdd.hp.com ------------------------------------------------------------- --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
