[DSLF] Digest Number 1725

[DarkSky-list@yahoogroups...]

There are 3 messages in this issue.

Topics in this digest:

      1. Re:Light and the magnetic compass
           From: "Friedel PAS" <friedel.pas@bvpartners...>
      2. Novelty in lighting domain !
           From: outdoor lighting <electricals_designing@yahoo...>
      3. Re: Light and the magnetic compass
           From: KDConod <kdconod@yahoo...>


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Message: 1         
   Date: Tue,  2 Aug 2005 08:57:04 +0200
   From: "Friedel PAS" <friedel.pas@bvpartners...>
Subject: Re:Light and the magnetic compass

A biologist that did a literature study for the Dutch government mentioned also that birds magnetic compas can be disturbed by light. He presented that also in a presentation on the 5th European Symposium for Protection of the Night Sky.

It seems that especially yellow lights (NaLP) is disturbing the compass of this birds. I have a paper about it in Dutch. But that is the only aspect that I know that NaLP has a damaging effect until now. Good shielded lighting can ofcourse avoiding this effect too, but especialy for NaLP their are no good fixtures on the market here.

Regards,

Friedel


VanDarkSky-list@yahoogroups...

NaarDarkSky-list@yahoogroups...

Cc

DatumMon, 01 Aug 2005 16:23:05 -0600

Onderwerp[DSLF] Light and the magnetic compass

> 
> Last wk a comment was made that light was not involved in
> magnetic compass orientation in animals. Jack Sales sent me
> this 2001 paper which refutes that statement. Seems the pineal
> gland distinguishes between long and short wavelengths of light
> and that affects magnetic orientation, at least in amphibians
> and fish.
> 
> Similarly, the human eye's retinal ganglion cells that innervate the
> circadian clock center which in turn tells the pineal gland to
> produce or suppress melatonin are more sensitive to short wavelengths
> (blue light at 464 nm) than the longer wavelengths of red light.
> 
> Do humans have a magnetic compass? I read about one account by
> Hawaiian & Polynesian voyage re-creator Nainoa Thompson:
> Nainoa used this sense one night on a voyage to Tahiti without any
> compass or other navigational aids.
> 
SNIP
> 
> http://www.biol.vt.edu/faculty/phillips/behavlab/publications/phillips-2001.pdf 
SNIP


Friedel Pas
Voorzitter
Preventie Lichthinder vzw
Gallifortlei 114
2100 Deurne
Tel.: +32-474-50.17.95
e-mail: friedel.pas@jvsorion...
http://www.preventielichthinder.be

Visit the site of 5the European Symposium for Protection of the Night Sky:
http://www.darksky-symposium2005.be
info: info@darksky-symposium2005...

-------------------------------------------------------
Scarlet Mobile - we cover 98% of the population 
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Message: 2         
   Date: Mon, 1 Aug 2005 11:13:57 -0700 (PDT)
   From: outdoor lighting <electricals_designing@yahoo...>
Subject: Novelty in lighting domain !

Novelty in lighting domain !

Edison thread fitting of 33millimeters or 1.30inch for lamps electrical 
contact.

http://electricals.fateback.com/e33_bases_lampholders/e33_bases_lampholders.html

Good luck in your jobs !
Electricals Designing Staff.


 

		
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 Start your day with Yahoo! - make it your home page 

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Message: 3         
   Date: Tue, 2 Aug 2005 10:15:54 -0700 (PDT)
   From: KDConod <kdconod@yahoo...>
Subject: Re: Light and the magnetic compass

> Do humans have a magnetic compass?  I read
> about one account by
> Hawaiian & Polynesian voyage re-creator Nainoa
> Thompson:
> Nainoa used this sense one night on a voyage to
> Tahiti without any
> compass or other navigational aids.

Steve --

To play devil's advocate - that is just
anecdotal. It would be easy enough to prove
though. You could design a double-blind
pin-the-tail-on-the-donkey type experiment to
prove that humans have a magnetic 6th sense.




Kevin Conod
kdconod@yahoo...


		
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