Was it from Flinders University. I remember seeing a story about the blue
LED glasses awhile ago on TV. Found this link:

https://socsci.flinders.edu.au/psyc/research/sleep/

The page includes the following:

___
Circadian rhythm phase shifting with the use of small light sources
Bright light stimulation has the capacity to shift the timing of circadian
(24-hour) rhythms of humans (the body clock). Sunlight or specially
constructed bright light boxes generating up to 3,000 lux of light at the
eyes can shift the timing of circadian rhythms to a later or earlier time
dependent on the timing of the light exposure. This phenomenon can be used
therapeutically to treat certain types of insomnia, jet lag, shift work
fatigue, and winter depression. However, these light sources are often not
available and have disadvantages of non portability and inconvenience which
reduce patient compliance and therapeutic effect. To overcome these
disadvantages we have developed small light emitting diodes (Leds) as an
effective light source. Although their total light output is minuscule
compared to the sun or light boxes, placed close to the eyes they can
provide up to 3,000 lux of light intensity. The first studies have found
significant melatonin suppression and phase delay during and following LED
light stimulation respectively but only with certain LED colours. The
studies have found the most effective LED colours to use for circadian
rhythm re-timing are in the blue and blue/green end of the coloured
spectrum. This research has led to the commercial development of blue LED
glasses for the application of bright light therapy, for sleep difficulties
caused by these body clock disorders.
Funding support:

Flinders Technologies, 1999-2000.

Principle Investigators:

Leon C. Lack, Prof., Helen R. Wright, PhD.

Publications:

Lack, L., Wright, H., Gibbon, S., Kemp, K. (2005). The treatment of
early-morning awakening insomnia with two evenings of bright light. Sleep
28, 616-623.

Wright, H., Lack, L. C., Tennaway, D. F. (2004). Differential effects of
light wavelength in phase advanging the melatonin rhythm. I Pineal Res., 36,
140-144.

Wright, H.R. , Lack, L.C., and Partridge, K.J. (2001). Light emitting diodes
can be used to phase delay the melatonin rhythm. Journal of Pineal Research,
31(4):350-355.

Wright, H.R. and Lack, L.C. (2001). Effect of light wavelength on
suppression and phase delay of the melatonin rhythm. Chronobiology
International, 18(5): 801-808.

Wright, H. R., Lack, L. C., Kenneway, D. J. (2004). Differential effects of
light wavelength in phase advancing the melatonin rhythm. J Pineal Rec, 36,
140-144.

___

Liron


"Adam Aglionby" wrote in message
...
On 1 Oct, 13:46, "dennis@home" wrote:
"Adam Aglionby" wrote in message

...



On 1 Oct, 10:07, "Mungo \"Two Sheds\" Toadfoot"
wrote:
Mungo "Two Sheds" Toadfoot wrote:

Are they A Good Thing for cheering up a kitchen through the winter,
and possibly having a beneficial effect on the symptoms of SAD? I'm
having some bother finding a 6' one locally but if they're worth
having I'll continue the search.

Si

And... is there any difference between 'normal' daylight tubes and
'full
spectrum' jobs?

added sci.engr.lighting as crosspost from uk.d.i.y

Probably several multiples of price.....

Full Spectrum is marketing mumbo, fluro by the very way it works has a
peak and trough spectral power distribution.
People like the dodgy Dr Ott sell all sorts of impressively packaged
"full spectrum" fluorescent lamps, if you really want full spectrum,
halogen has a continuous spectral output.

Daylight tubes are often just high colour temperature, which in an
internal kitchen might look very cold and as Andrew said can have poor
actual colour rendering. High colour rendering index lamp is really
more what you want, decent lamps made by big manufacturers aimed at
things like the print, textile and car refinishing business be more
appropriate.

Some research says colour does make a difference, been some research
on use of blue LED in resetting circadian rythmns in the elderley,
some research says intensity matters some that time and length of
exposure is most important, doesn`t seem to be a well understood
phenomenon.Offering opportunity for snake oil salesman to enter the
fray.

Probably BS though as sunlight is not blue and its lack of sunlight that
causes SAD.

Cant place the link offhand but it was serious research, blue LED
because its a very efficient generator of blue light aginst tungsten
or even fluro. Sunlight contains a lot of both visible and increasing
amounts invisible blueviolet radiation....

I would use warm white tubes myself and you need plenty of them, one tube
is
not what you usually see to treat SAD, maybe five tubes or a 250w metal
halide lamp?

Intensity dosen`t seem to be universally accepted as the main
factor ,though personally think it is probably one factor.

Adam




Adam