[time-nuts] Reducing lab noise with LED lighting.

Morris Odell vilgotch at bigpond.net.au
Wed Sep 19 02:49:52 UTC 2012


I've tried that with a replacement tube that worked with the original
ballast, all you had to do was remove the starter.

The results were horrible. The tube was about a metre above my scope and
waving the probe about showed horrible spikes and damped oscillatory
waveforms up to several volts in amplitude. Needless to say I'm back to a
conventional fluoro.

The discussion about LED flicker was interesting. As I understand it the
human eye can act as a peak detector so it responds quite well to pulsed
lights at a high enough frequency. I'm currently (boom boom) illuminating an
ornamental vacuum tube display with a strip of white LEDs powered by full
wave rectified but unfiltered DC at 100 Hz (in a 50 Hz country). It's in an
otherwise dim corner and there's never been any hint of visible flicker to
me or anyone else. 

Morris

Date: Tue, 18 Sep 2012 17:22:44 -0500
From: Bob Smither <smither at c-c-i.com>
To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Reducing lab noise with LED lighting.

Has anyone tried the fluorescent replacement LED tubes? Apparently you
remove the ballast from the fixture and power the tube from the 120V AC
line.

Any chance these would reduce the noise in a lab from conventional
fluorescent tubes?

Thanks.





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