The well designed passive solar home provides significantly improved natural lighting or daylighting.
This improved daylighting provides many benefits such as reduced need for energy consuming lighting; reduced heating loads caused by artificial lighting and measurably improved internal environmental quality.
Evidence from health and education institutions around the world testifies to the benefits of natural daylighting over the use of artificial lighting.
Learning outcomes have been measurably improved in schools and in hospitals documentation shows the value that daylighting plays in accelerating healing and reducing the length of illness.
The sun is the greatest light bulb there is so we should take advantage of it. How many homes do you visit during the day that have the lights on because it is too dark without them on? That is a waste of power and a waste of our resources.
Natural lighting is another major component of passive solar design and sustainable buildings in general.
It is also a major contributor to improved internal environment quality. In addition, the use of the correct type of thermal windows allows a much greater area to be available for natural lighting, increasing the views as well as allowing greater flexibility in faade and window design. This flexibility offers many more options for opening and shutting certain window sections which then results in an improved ability to manipulate breezes and the potential of cross flow ventilation. The multi benefit from improving daylighting can be seen here. Improved daylighting allows reduced artificial lighting, increased ventilation abilities, improved views etc.
Spending time in a naturally lit home is more comfortable and relaxing.
There is no flicker from fluorescents; glare is reduced while the colour of natural lighting improves the ability to read. There are also fewer globes to replace and maintain. Additionally you have reduced the cost of running your home while reducing green house production. Another example of the win/win advantage of sustainability!