<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Times New Roman; font-size: 12pt; color: #000000'>Some of the LED lamps have a circuit to pulse the lamp to a higher vltage and make it look brighter<br>and keep the current low. Depends on eye persistence . It is a square wave so it puts out harmonics.<br>Nothing is at it seems when the snake oil marketers get a hold of anything.<br>Dale<br><br>----- Original Message -----<br>From: "david vanhorn" <kc6ete@gmail.com><br>To: "TAPR APRS Mailing List" <aprssig@tapr.org><br>Sent: Tuesday, May 31, 2011 5:41:17 PM<br>Subject: Re: [aprssig] CFL Bulbs and Shack backup power ;-)<br><br><br>Something to be aware of with LED lamps, a friend of mine runs an EMI test facility, and out of professional curiosity he has purchased and tested some of the new LED lamps in his GTEM against FCC class A limits. To quote him: " Some that I tested, NO WAY IN HELL would they pass."<br>
<br>I didn't press for details, but just a word to the wise: Don't get heavily invested till you find out how much noise they might make at your particular frequencies of interest.<br><br><br>
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