[aprssig] CFL Bulbs and Shack backup power ;-)

[DALE]

Some of the LED lamps have a circuit to pulse the lamp to a higher vltage and make it look brighter 
and keep the current low. Depends on eye persistence . It is a square wave so it puts out harmonics. 
Nothing is at it seems when the snake oil marketers get a hold of anything. 
Dale 

----- Original Message ----- 
From: "david vanhorn" <kc6ete at gmail.com> 
To: "TAPR APRS Mailing List" <aprssig at tapr.org> 
Sent: Tuesday, May 31, 2011 5:41:17 PM 
Subject: Re: [aprssig] CFL Bulbs and Shack backup power ;-) 


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." 

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. 



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