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[DSLF] Digest Number 1455

There are 5 messages in this issue.

Topics in this digest:

      1. Relay of Light Pollution
           From: Susan Harder <lookout@hamptons...>
      2. great site
           From: Susan Harder <lookout@hamptons...>
      3. articles on Childhood Leukaemia
           From: Jan Hollan <jhollan@amper....muni.cz>
      4. Re: definitions
           From: Bernard Kosicki <kosicki@ll....edu>
      5. Re: definitions
           From: "patric@ghostriders..." <patric@ghostriders...>


Message: 1         
   Date: Tue, 21 Sep 2004 12:37:04 -0400
   From: Susan Harder <lookout@hamptons...>
Subject: Relay of Light Pollution

If anyone gets a chance, please let Lippitsch know that it is not just the
astronomers who object to his project.

Susan Harder


Message: 2         
   Date: Tue, 21 Sep 2004 15:53:41 -0400
   From: Susan Harder <lookout@hamptons...>
Subject: great site

Here is an excellent webpage of information and good advice about
dealing with light pollution, prepared by Tim Poulsen for the NY State
IDA Affiliate, SELENE.


Thank you, Tim!

Susan Harder


Message: 3         
   Date: Tue, 21 Sep 2004 21:04:05 +0200 (CEST)
   From: Jan Hollan <jhollan@amper....muni.cz>
Subject: articles on Childhood Leukaemia

Sam Milham remembered his revealing paper (published together with
E. M. Ossiander) at the conference:

 Historical Evidence that Residential Electrification caused the
 emergence of the childhood leukemia peak.
 -- abstract and hypertext references are at

He suspects magnetic fields from the wires. However, it appears that that
the most toxic part of electromagnetic radiation longwave-ward from UV
might be ...light.

A couple of articles from the Children Leukaemia conference below might
give a hint about that. Together with Russel Reiter I suspect that it was
the sudden rise of the amount of light at night that brought the ``peak''
(more accurately, steep rise of incidence, which rises more slowly ever
since). The amounts of electricity used at fist installations were perhaps
too small to cause such an effect directly. But light, through a
pronounced melatonin production suppression, could do that rather easily.

wishing you healthy ( => dark, of course) night,


Medical News and Health News from Medical News Today:

 Rising childhood leukaemia incidence prompts conference

 New evidence of radiation risk in childhood leukaemia

 Pesticide exposure in utero linked to childhood leukaemia

 Increase in childhood leukaemia may be part due to increased light at

 New research suggests link between maternal diet and childhood leukemia

 Early diet may play key role in protecting against childhood leukaemia


Night Light Suspected in Rise in Child Leukemia
  "By Patricia Reaney

   LONDON (Reuters) - A growing body of evidence linking increased night
   light to certain types of cancer has led researchers to suspect it
   could be connected to the steady increase in cases of childhood


Increase in childhood leukaemia may be part due to increased light at night

New evidence of radiation risk in childhood leukaemia

Sleeping with lights on linked to child leukaemia
   By Rebecca Smith, Evening Standard Health Reporter

Sleeping with the light on 'raises child leukaemia'

Oranges, bananas and turmeric prevent leukaemia | New Scientist

Reuters: Childhood Leukemia Incidence Rising, According to British Experts


Message: 4         
   Date: Tue, 21 Sep 2004 16:52:43 -0400
   From: Bernard Kosicki <kosicki@ll....edu>
Subject: Re: definitions

At 10:21 PM 9/18/2004 -0400, Stan wrote:
>Gail wrote that she preferred the term "fully shielded," and I can appreciate
>her point that it appears to be more user friendly.  .....

>  .....However, IMO, even though FCO and CO definitions are thrown
>around carelessly and sometimes deceptively, there are many quality lighting
>manufacturers who have tested their fixtures and have published 
>photometrics to
>vouch for their FCO or CO compliance.

It would be nice if definitions existed that were ...

-stable and unchangeable
-agreed upon by everyone
-understood by everyone (simple)

...but that isn't the case yet, so we all have to make do with what we have.

FCO, as Stan points out, has a generally precise meaning among 
professionals, but the electrician and installer (and unfortunately, some 
who call themselves lighting designers) don't know what it means.

Fully Shielded is fairly easy to understand by non-professionals (who want 
to understand it), but doesn't have a generally accepted definition yet.

In Acton, we agree both with Gail and Stan in writing our new bylaw.

-Generally, we used the term "fully shielded" for most of the bylaw.  Since 
this is not a term with specific and general definition in the industry, we 
both define it, tell how it is related to the FCO definition, and then have 
numerous pictures of luminaires that both comply and don't comply.  It is 
pointed out, as Gail suggests, that an FCO luminaire also is Fully Shielded.

-For use in the few parts of town in which lighting may be specified by the 
Historic District Commission, we allowed lighting of up to the the IESNA 
Cutoff (CO) specification.

-Both FCO and CO are defined in the bylaw.

Bernie Kosicki
Acton, MA


Message: 5         
   Date: Tue, 21 Sep 2004 23:39:58 -0500
   From: "patric@ghostriders..." <patric@ghostriders...>
Subject: Re: definitions

 > It is
> pointed out, as Gail suggests, that an FCO luminaire also is Fully Shielded.

Over the years I have collected a number of photos illustrating light 
trespass, and some of the big offenders include improperly placed FCO 
Given that, shouldnt a time-tested definition of 'fully shielded' be 
based on outcome performance rather than stock, off-the-shelf luminaires 
marketed as a 'one size fits all' solution?


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