Subject: (Tegenfeldt) Re EMFs from fluorescent tubes (fwd)
Date: Wed, 25 Nov 1998 093500 -0600 (CST)
From: "Roy L. Beavers" <rbeavers@llion.org>
To: emfguru <rbeavers@llion.org>
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---------- Forwarded message ----------
Date: Wed, 25 Nov 1998 16:29:49 +0100
From: Clas Tegenfeldt
To: "Roy L. Beavers"
Subject: Re: EMFs from fluorescent tubes
At 14:52 1998-11-23 -0600, you wrote:
>Date: Mon, 23 Nov 1998 10:24:34 -0800
>From: Edward S Maxey
>Subject: polarity
...
>Long fluorescent tubes are frequently seen under ceilings in
>supermarkets etc. Sometimes two (or more) are placed
>side by side parallel to each other. If they are wired so that
>their polarities are the same the 50-60 Hz EMFs from the
>tubes become additive. If their polarities are reversed the
>EMFs tend to cancel out.
Hi all!
I just want to mention that it is also important to return
the current in close proximity to the tube to cancel out
the fields. But please remember that fluorescent tubes in
fact /depend/ on fields to work... We donīt want to remove
all the fields. What we want it just to contain them inside
the enclosure (light fitting).
Apart from polarity there is also a question of phase. By just
wiring the fluorescent tubes to all three phases you can gain a lot.
One good solution is to have three tubes in one fitting, each
tube to one phase. This would then reduce the neutral current
in the installation since each phase would share an equal
amount of the illumination load (of course the problem with
every third harmonic is still left to solve). It would also
reduce the light flicker since each of the three tubes would
give off light at different times, thus we also reduce the
light modulation! The fields given off the tubes will also,
of course, tend to cancel out, just as the main principle
thought behind three phase systems meant to.
Clas Tegenfeldt ,,,
(o o)
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Reprinted with permission of Roy Beavers, http://www.feb.se/EMF-L/EMF-L.html