[RFI] LED Under Cabinet Kitchen Lights YES or NO

Mike Ryan mryan001 at tampabay.rr.com
Fri Jul 26 18:44:30 EDT 2013

So if I am reading correctly what Jim and Jeff are saying, it is not the LED 
lamps or LED 'tape' reel lights that are the issue themselves. It is the 
POWER SUPPLY that is used with them.  I wonder how a wall wart or even a 
commercial 12v supply such as a small Astron or other supply would react 
with a DIMMER?  Is the dimmer used in the 12v side to the lights or to the 
actual power supply, if in fact this is practical?
   I would consider fluorescent lights like a 24" or 30" etc device but have 
not seen ANY that work with dimmers.  - M

-----Original Message----- 
From: Jim Brown
Sent: Friday, July 26, 2013 12:36 PM
To: rfi at contesting.com
Subject: Re: [RFI] LED Under Cabinet Kitchen Lights YES or NO

On 7/26/2013 3:04 AM, Mike Ryan wrote:
> I did some reading on line where one guy indicated that the power supply 
> (he assumed) to his under cabinet lights was destroying his AM radio.

This problem is so common that it is nearly universal. 99.99% of this
stuff is sold with a noisy switching power supply. One aspect of the
problem that makes a solution difficult is that a transformer or linear
power supply that can provide the needed current often does not fit in
the available space.

The good news is that LED lighting draws less current than other
lighting devices, so an old analog wall wart may be enough to do the
job.  For the last few years I've been seeing vendors of little LED
lighting strips at hamfests like the ones Jeff, AC0C, describes, and
I've bought a few that I haven't gotten around to installing yet. My
neighbor, W6GJB, has used them in a nice portable rack that he built to
take his K3, P3, and KPA500 out on CQP expeditions.

Going through my junk box the other day, I found four vintage linear
wall warts rated for 1A at 12VDC, and you can buy a lot more for a buck
a piece at most hamfests.

73, Jim K9YC

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