[Elecraft] Dimmable LED desk lamp for operating position recommendation needed

[Bill Frantz]

To avoid color shifts with dimming, most LED dimmers use Pulse 
Width Modulation (PWM). PWM has the potential to generate RFI, 
so be careful. The LEDs themselves should be very quiet. Using 
LEDs with resistors to limit the current should also be quiet. A 
system that switches LEDs for brightness control would be a safe 
solution, but I don't know of any commercial systems which do this.

On the other hand, I have not noticed a problem with the LED 
dimmers in my house, so perhaps most of the problem is in the 
wall-wart power supply.

73 Bill AE6JV

On 1/6/17 at 3:50 AM, elecraft at mailman.qth.net (Marc Veeneman 
via Elecraft) wrote:

>I mounted (dual side adhesive tape) an LED strip to the 
>underside of an equipment shelf.  The strip came with a 12v 
>switcher that I ignored.  I use my 12 volt supply.  The strip 
>was, I think, 24 inches long and has a dimmer that can be 
>inserted in the power lead.  No RFI.  Plenty bright.  Mine came 
>from Amazon but there are many to choose from these days; you 
>can even select color temperature when you order.
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