The deficiency in vitamin D causes bones and teeth diseases.

But even more important, recent studies suggest that exposure to sunlight may reduce the risks of certain cancers such as breast, colon and prostate.

However­, I do believe raising a child must follow the same principles always: love giving and a lot of socialization, which no technology can supply.

For those who will not consider socialization a key factor in raising children, I'd like to suggest a glance at 'Independent Rational Animals', by Professor Alasdair MacIntyre.

Therefore, instead of following the sensible way, which is to keep healthy, we make our own diseases and then hire personal trainers and doctors to help us.

One failure of modern education is actually not to consider the individual as a whole. That's why so many western people end by turning to oriental practices and philosophies.

This will change according to each individual as to each moment in life. When I'm attached to projects which demand too much, all I'll want is a good night sleep.

In the past, fixing my house could be a great stress relief, as the place I live in needed a lot to be done and it was very satisfying to make it cosier. Gardening is one of the ways I relax nowadays, since the structural problems of my home were fixed.

Someone whose job demands too much patience may feel the need of practicing a martial art in order to bring an emotional balance to aggressivity, for instance.

We must keep the drill to make our lives fuller and balanced and not allow ourselves to accomodate to routine. Be it relaxation, a hobby, physical activity, it's up to each one to find what recovers mind and body and makes life fuller.

- I'm waking up earlier and clearer in the morning.

There are a lot more people out and about and the atmosphere seems much more friendly

- Lunchtimes I make an effort to go for a short walk to enjoy the weather

- I also love the fact that it's still light out when I get home. It seems that there's much more time to enjoy my evening and this gives me a much better feeling about my work/private time balance

I'm not clear on the fact if this positive effect is physical and/or mental.

My positive frame of mind urges me to undertake more physical activities, which makes me feel better about well being in return.

So yes, (sun) light certainly effects my overall well being. Has there been any testing by Philips if these effect can be triggered by man-made light?

It is often said that a healthy diet and sports help balance out a stressed job.

Of course, while biometric/electronic locks provide better security and more convenience, it relies (like JBonnin pointed out) on electricity.... So either you'd keep having to replace the batteries on the unit or good luck to you when the electricity is out.

KEEP the different sizing!