Light, specifically natural sunlight, plays a very important role in our life. Exposure to sunlight affects the hypothalmus, which is perhaps the most important part of the brain. It controls and oversees the nervous system and the endocrine system, along with most of our other body functions.
With decreased light exposure, production of melatonin goes up and causes fatigue; with increased light exposure, production of serotonin increases and elevates your mood and makes you more mentally alert.
Our body clocks are instinctively attuned to the sun's progress through the day. We get up in the morning and we go to bed after the light fades. Any changes in this rhythm upsets our balance, as people suffering from jet lag or those who switch their work schedule abruptly from day shifts to night shifts will attest.
Lack of sufficient sunlight can lead to various disorders like depression and seasonal affective disorder (SAD). Such disorders are becoming more prevalent now than they ever were, because more and more people nowadays spend a considerable portion of their time inside inadequately-lit homes and office buildings.
You will suffer less eye strain, headaches, and general fatigue. They help improve the immune system, decrease blood pressure problems, and decrease insomnia.
They may be a tad expensive to purchase, but that extra expense balances out with their longer life expectancy and the fact that they also consume a lot less energy than usual light bulbs (which is good news for the levels of your electricity bill), and are environmentally friendly.