Well, this started out as a good question.

So, I will comment on what interests me even if it might NOT answer
your question directly.

Research on the benefits of light regarding what exactly is producing
the benefit has been mixed.

The benefits could be coming from vitamin D, all light in general, or
specific wavelengths of light.

Why fluorescent lights are not effective is likewise undecided.  It
could be due to the fact that fluorescent lights flicker.

The harmful effects of sunlight on both your eyes and skin is caused by
the blue spectrum, which loosely also includes ultraviolet light rays.
Skin sunscreen lotions  block the absorption of UV-B which causes
sunburns. The UV-A light rays, which generally are not blocked, causes
your skin to age and wrinkle.

Scientific research in areas like this can be compared to a monkey
producing a copy of Moby Dick by typing on a typewriter.  That is
precisely how this type of research is conducted in America.
Researchers are idiots who know nothing about the subject area they are
testing. They are bascially testing things at random, just like a
monkey typing on a typewriter.  Often researchers are hostile to the
entire subject area being tested.  And, it really shows in the results
of these idiotic research studies. Is it any wonder that science by
itself will never benefit anyone.

The research industry is anything but rational and / or efficient.
--
john gohde
http://naturalhealthperspective.com

http://www.brown.edu/Administration/News_Bureau/2005-06/05-059.html
Neuroscience
Not So Different After All: Mysterious Eye Cells Adapt To Light

http://apu.sfn.org/content/AboutSFN1/NewsReleases/am2002_circadian.html
INSIGHTS INTO THE BODY'S DAILY CLOCK MAY HELP OVERCOME JET-LAG, WORK
FATIGUE.

http://www.findarticles.com/p/articles/mi_m0ISW/is_2003_July/ai_104259134
Hypothyroidism, temperature regulation, and ethnoscience - Medical
Anthropology
"The importance of sunlight for thyroid function may be related in part to
the increase in vitamin D which it causes, which is only found in animal
foods. It has long been known that consumption of vegetables in the Brassica
family can inhibit thyroid function.

An outdoor lifestyle seems protective against hypothyroidism as described in
the above anthropological studies of various indigenous populations. One
reason may be exposure to sunlight. Morning light advances physical
activity, hormone secretion, urine output, body temperature, and stimulates
the thyroid to burn body fat, while evening light makes the same events
occur later. Farm animals living outdoors don't fatten as easily as those
living indoors. UV stimulates the thyroid to increase metabolism, which
burns calories (Lamberg: 1994). In the 1930s Swiss sun therapists found
clients had little fat even without exercising for months and
well-functioning thyroid glands. (Kime and Lohmeier: 1986). Two hours of
bright light in the morning reduces nocturnal restlessness in patients with
Alzheimers as well as SAD, an affective disorder related to depression, by
increasing serotonin levels. In industrial societies children experience
growth spurts during the spring as their metabolism speeds up and thyroid
hormone s peak."

http://www.thyroid-info.com/articles/winterizing.htm
6. Get some sunlight every day.

There's evidence that exposure to sunlight affects hormones that have an
impact on both brain chemistry and the endocrine system. Even if you don't
suffer from a full-out case of "seasonal affective disorder", 20 to 30
minutes a day of outdoor light exposure can help ward off fatigue and
depression. My doctor's own tip...if you don't want to be outside for
prolonged periods when it's cold, go run errands in your car, but keep the
window open, so you are exposed to the natural sunlight. (Keep in mind,
wearing sunglasses will reduce the benefit of the sunlight.)

Hello,

We have understandings that we get Vit.D and Sunburns by exposing us to
sunlight. We also get visuality and solar energy from it. Some harming
germs may be killed by it. We also get botanical materials growns under
its influence. It is mostly composed of seven wavelengths with some IR
and UV rays. Sun, spritually, is/was also consdered as "god of health
giver".

We have natural and unnatural, continious and prolonged(since our
evolution) exposure to many substances with and without physical
ingestion of them. All objects, on exposure to sunlight, reflect
wavelengths relavent to their colors, absorb and emit others. We are
getting preception and sensations to those reflected or emitted
wavelengths.

I have few questions:-

1. How reflections and emittions from any substance on their exposure
to sunlight can effect us physiologically and psychlogically?

2. Can sensations (taste, thinking, looking, hearing,felling,smelling)
of any food to be taken effects us apart from its ingestion
effect--pre-stomach in view of reflections and emittions from those
foods substance on their exposure to sunlight ? One theory, we have
about "cephalic phase effect".

3. Can such sensations will be a weak effect or weak sumuli and
specific effects to specific part of body WHERAS effects post-stomach
by absorptions may be systematic effect?

4. How as such, following (others pls tell) laws can be related to weak
stumuli pre-stomach by just sensations other that "ingestion effect"
post stomach?

"Allen's paradoxic l.  whereas in normal individuals the more sugar is
given the more is utilized, the reverse is true in diabetics.

Arndt's l. ,  Arndt-Schulz l.  weak stimuli increase physiologic
activity, moderate stimuli inhibit activity, and very strong stimuli
abolish activity. See also hormesis

hormesis (hor·me·sis) (hor-me´sis) [Gr. hormçsis rapid motion]  the
stimulating or beneficial effect of small doses of a toxic substance
that at higher doses has an inhibitory or adverse effect. "

( from Donald medical dictonary)

Best wishes.

One more reference:

http://www.nmha.org/infoctr/factsheets/27.cfm

     Seasonal Affective Disorder
     "What is Seasonal Affective Disorder?
     Some people suffer from symptoms of depression during the winter
months, with symptoms subsiding during the spring and summer months.

<snip>
Symptoms Include:

 a.. regularly occurring symptoms of depression (excessive eating and
sleeping, weight gain) during the fall or winter months.
 b.. full remission from depression occur in the spring and summer months.
 c.. symptoms have occurred in the past two years, with no nonseasonal
depression episodes.
 d.. seasonal episodes substantially outnumber nonseasonal depression
episodes.
 e.. a craving for sugary and/or starchy foods. "
<snip>

See link for rest of the article

Hello,

We have understandings that we get Vit.D and Sunburns by exposing us to
sunlight. We also get visuality and solar energy from it. Some harming
germs may be killed by it. We also get botanical materials growns under
its influence. It is mostly composed of seven wavelengths with some IR
and UV rays. Sun, spritually, is/was also consdered as "god of health
giver".

We have natural and unnatural, continious and prolonged(since our
evolution) exposure to many substances with and without physical
ingestion of them. All objects, on exposure to sunlight, reflect
wavelengths relavent to their colors, absorb and emit others. We are
getting preception and sensations to those reflected or emitted
wavelengths.

I have few questions:-

1. How reflections and emittions from any substance on their exposure
to sunlight can effect us physiologically and psychlogically?

2. Can sensations (taste, thinking, looking, hearing,felling,smelling)
of any food to be taken effects us apart from its ingestion
effect--pre-stomach in view of reflections and emittions from those
foods substance on their exposure to sunlight ? One theory, we have
about "cephalic phase effect".

3. Can such sensations will be a weak effect or weak sumuli and
specific effects to specific part of body WHERAS effects post-stomach
by absorptions may be systematic effect?

4. How as such, following (others pls tell) laws can be related to weak
stumuli pre-stomach by just sensations other that "ingestion effect"
post stomach?

"Allen's paradoxic l.  whereas in normal individuals the more sugar is
given the more is utilized, the reverse is true in diabetics.

Arndt's l. ,  Arndt-Schulz l.  weak stimuli increase physiologic
activity, moderate stimuli inhibit activity, and very strong stimuli
abolish activity. See also hormesis

hormesis (hor·me·sis) (hor-me´sis) [Gr. hormçsis rapid motion]  the
stimulating or beneficial effect of small doses of a toxic substance
that at higher doses has an inhibitory or adverse effect. "

( from Donald medical dictonary)

Best wishes.