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

Bob Camp lists at rtty.us
Mon Sep 17 16:23:12 UTC 2012


Hi

The other advantage of the pre-made bars is that they fit into conventional
fixtures. Glare from a wide open high intensity LED can be pretty nasty.
Diffusers and reflectors can be good things. Glare is what has very much
slowed down my deployment of LED's at home...

Bob 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chris Albertson
Sent: Monday, September 17, 2012 11:53 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Reducing lab noise with LED lighting.

On Mon, Sep 17, 2012 at 8:08 AM, Tom Knox <actast at hotmail.com> wrote:
>

> The conversion will cost about $100 on the surplus market if you had none
of the needed items and should pay for it self over the next few years in
energy costs.

If you care about energy costs AND getting the maximum brightness you
really need a constant current power supply.  You can't use a current
limiting resister as that will just turn your power into heat.  The
old PC power supplies are voltage regulated.  Linear voltage
regulators and series resisters are both easy to use but if you care
about power costs the only way to go is a constant current SMSP.   You
can make a dimmer by adjusting the current output.

Or you can simply buy pre-made LED light bars that are the exact shape
to replace fluorescent bulbs.  They fit into existing fixtures.   At
work that replaced all the bulbs in the parking garage and not only
did each stick use less power but they were able to leave almost half
the fixtures empty.   Payback should be in a few years.



Chris Albertson
Redondo Beach, California

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