[DSLF] Digest Number 1733

[DarkSky-list@yahoogroups...]

There are 4 messages in this issue.

Topics in this digest:

      1. RE: Light at Night and Cancer
           From: "Greg Crawford" <gc@nelsonbay...>
      2. Re: Light at Night and Cancer
           From: Steve Davis <w2sgd@juno...>
      3. Lowbluelights.com
           From: Stephen Pauley <spauley2@cox...>
      4. RE: Lowbluelights.com
           From: "Greg Crawford" <gc@nelsonbay...>


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Message: 1         
   Date: Sat, 13 Aug 2005 10:40:05 +1000
   From: "Greg Crawford" <gc@nelsonbay...>
Subject: RE: Light at Night and Cancer

Well, what do you know? The regional newspaper printed my letter, and in the
Saturday morning edition, which probably has the largest circulation for the
week. The editor kindly gave my letter the heading, "Light at night may kill
you". The only thing edited out was the URL for the IDA Photobiology Working
Group. This may be a policy regards weblinks, or perhaps they are just too long
for a newspaper column.

Thanks to all who assisted with information.

- Greg




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Message: 2         
   Date: Sat, 13 Aug 2005 09:21:03 -0400
   From: Steve Davis <w2sgd@juno...>
Subject: Re: Light at Night and Cancer

Jan wrote:
> Sleep disruption is starting at 0.1 lx falling onto windows
> (Moon near full)

Different strokes for different folks.  I have sleep problems
with half full Moon (0.01 lux) and have to pull the shades.
This probably means my level is even lower yet and may
be due in part to long term exposure to streetlights, which
btw, don't operate on a 28-day lunar cycle.  Also, cloud cover
- plenty of that here - blocks moonlight and reflects streetlights.
Remember too that full moon light indoors is less than outdoors
by virtue of having a roof over your head and walls.  In addition,
the Moon is higher in the sky than any streetlight making the
source less visible and light ray path different. -sd
 






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Message: 3         
   Date: Sat, 13 Aug 2005 09:54:51 -0600
   From: Stephen Pauley <spauley2@cox...>
Subject: Lowbluelights.com

Terry wrote
 >>The web site http://www.lowbluelights.com  has some additional information
on this subject and an up-to-date list of research papers.  It's also an
example of one way a small part of the lighting industry is beginning to use
the information>>.
----------------
Terry
This is great news.  Lowbluelights.com makes
yellow bulbs (cf, fluorescent, incandescent, and LED) and all filter
blue light so night time melatonin production is not suppressed.

This is the first instance I've seen of the industry responding
specifically to the LAN- human health issues.  Note that these
are for night lighting, not daytime lighting where one should use
full spectrum lights to re-set the human circadian clock.

I will ask the IDA to place these in a separate category on the fixture
approval page, perhaps under Lighting Products That Protect
Human Health (with the caveat that when used outdoors they be
placed in fully shielded fixtures).

Their web site should also be placed on the IDA's Photobiology web
pages.
Regards,
Steve Pauley



[Non-text portions of this message have been removed]



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Message: 4         
   Date: Sun, 14 Aug 2005 02:02:32 +1000
   From: "Greg Crawford" <gc@nelsonbay...>
Subject: RE: Lowbluelights.com

This is the first instance I've seen of the industry responding
> Note that these
>are for night lighting, not daytime lighting where one should use
>full spectrum lights to re-set the human circadian clock.

This seems to create a practical difficulty. Consider a place such as a hospital
or nursing home where three shifts might cover a 24 hour period. How realistic
is it to have interior daylight, as well as night light (without the blue)? Does
this present a technical difficulty for lighting of the workplace from the point
of view of lighting engineers?

- Greg




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