NEW YAHOO GROUP: Full Spectrum Lighting

[Lady Liberty]

http://groups.yahoo.com/group/Full_Spectrum_Lighting

 

[Daniel J. Stern]

How appropriate: a *yahoo* group for something only yahoos believe in.

 

[Steve Spence]

How appropriate: a *yahoo* group for something only yahoos believe in.

WebMD suggests these products as therapy for reducing the effects of
Seasonal Affective Disorder. Are you suggesting they are incorrect?

 

[Andrew Gabriel]

Think Dan is questioning the use of the phrase "Full Spectrum Lighting"
especialy with reference to fluorescent lamps.

Light therapy for SAD appears to be a therapy that works for many, but
is over run with snake oil salesman peddling "Full Spectrum Lighting"
at exorbitant cost.

....and haven't got a clue what the difference is between
high colour temperature (which is mostly what's offered)
and full spectrum (which is mostly a misused term).

 

[Eric Gisin]

WebMD suggests these products as therapy for reducing the effects of
Seasonal Affective Disorder. Are you suggesting they are incorrect?

The term "full spectrum lighting" is only used by quacks.
Engineers use CRI and colour temp to describe light quality.

Any high-intensity light source is benefical.
You could put a 250W (25,000 lumen) metal-halide in your living room,
instead of sitting in front of 5,000 lumen light box.

 

[Don Klipstein]

Might I suggest in this topic also, that the recently discovered
Cirtopic response receptors in the eye (peaking somewhere between 465nm
and 490nm) could possibly be the route by which Seasonal Affective
Disorder is mitigated? Maybe optimising this part of the spectrum is
what is wanted? Colour rendering might be a well defined and repeatable
measure, but its a vain hope that it is a good measure of SAD
efficacy....

Has anyone found or proposed a bandwidth or a response curve shape for
the cirtopic response?

- Don Klipstein ([email protected])

 

[Clive Mitchell]

The term "full spectrum lighting" is only used by quacks. Engineers use
CRI and colour temp to describe light quality.

I've got some full spectrum SAD compliant CFL's here if anyone is
interested. They radiate great feelings of wellness from conventional
BC lampholders.

There's some writing on the side of them that says:-

Pound-blasters
11W 240V 999mA
Cos phi <0.1
6400K (+/- 50%)
Life 15,000 hours.
Not guaranteed under all operating conditions. (Powered for instance.)

At 20 UKP each inclusive of shipping they're a real bargain and will
make you and your children the envy of the neighbourhood.

These can also be used to make colloidal silver olive oil if dipped in
orgone energised cluster water and poked with a lost cubit. It's a
little known fact that the Egyptian goddesses used CFL's to make the
earth spin faster during the 1960's. By buying my overpriced lamps you
can recreate this effect and fill your families heads with gorgon power
beams.

 

[TKM]

Has anyone found or proposed a bandwidth or a response curve shape for
the cirtopic response?

- Don Klipstein ([email protected])

And not only the spectral response curve, but also the intensity, duration,
timing (when the light should be applied) and the distribution of light over
the eye?

Light is energy. To have any effect on the eye or body, you have to know
the "dose". Spectrum is just one part of the dose -- and it may not be
particularly important compared to the other factors. Where's the rest of
the information?

Terry McGowan

 

[Victor Roberts]

The term "full spectrum lighting" is only used by quacks.
Engineers use CRI and colour temp to describe light quality.

I wouldn't dismiss the possibility that the details of the
SPD have more importance than can be described by the CCT
and CRI. However, the problem with "full spectrum" is that
it is an undefined term that means different things to
different people and therefore can be anything that a
company wants it to be. The term is worthless, not the
concept that different SPDs that have the same or similar
CCT and CRI may be perceived differently by people or even
have some beneficial effect in some situations.

--
Vic Roberts
http://www.RobertsResearchInc.com
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[Don Klipstein]

Has anyone found or proposed a bandwidth or a response curve shape for
the cirtopic response?

Yes, the link I posted recently to Dr. Berman's 2005 paper has a
response curve near the end of it.

www.ceisp.com/simposium/pdf/simposiumCIE_Leon/ponencias/002pastvision...[/QUOTE]

Thanks for this! Looks like you caught me a bit asleep at the switch...

I had to go to Google to find your link in full. The link in full split
into 2 lines is:

http://www.ceisp.com/simposium/pdf/simposiumCIE_Leon/ponencias/
002pastvision.pdf

Meanwhile, the bandwidth of this one in a graph that I saw there appears
only very slightly narrower than those for scotopic and photopic human
responses.
This makes me think that a lamp with high CRI and scotopic/photopic
ratio close to that of daylight (of same CCT as lamp in question) should
have cirtopic/photopic function "in the ballpark" of daylight of same CCT.

- Don Klipstein ([email protected])