[time-nuts] White LED's

[Robert Atkinson]

I have some Philips LED halogen downlighter replacements. They are rated at 3W and produce a noticeable glow when "OFF". They are on a 2-way circuit and the stray capacitance of the wiring allows enough current for a faint glow.
Robert G8RPI. 

--- On Sat, 30/1/10, Chuck Harris <cfharris at erols.com> wrote:

From: Chuck Harris <cfharris at erols.com>
Subject: Re: [time-nuts] White LED's
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Date: Saturday, 30 January, 2010, 14:27

I bought some of the LED replacements for Edison bulb incandescents, and
they have an afterglow that lasts for several minutes.  It is very much
dimmer than when they are turned on, but is there none the less.

-Chuck

Bruce Griffiths wrote:
> The speed isn't  terribly surprising since the "phosphor" used  is actually a scintillator.
> Unlike phosphors scintillators don't have long decay times so there is no afterglow like that from a phosphor.
> 
> The IKEA LED lamp output may not be significantly modulated if the wall wart constant current supply may have an output thats a little smoother than just rectified AC.
> 
> Bruce

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