natural light

People love natural light. Subconsciously, unknowingly, we seek out sunlit places and enjoy spending time in natural light. Beyond this desire, however, are some tangible benefits to adding natural daylighting into buildings.

Studies have proven daylighting makes employees more comfortable and productive. Reduced absenteeism, employee satisfaction and higher productivity are all bottom line benefits from the use of natural daylighting. An increase of just 1% in productivity provides enough financial savings to a company to pay their entire energy bill.

In a jointly published study, Greening the Building and the Bottom Line: Increasing Productivity Through Energy-Efficient Design, the U.S. Department of Energy and the Rocky Mountain Institute describes these benefits in greater detail. This study provides numerous case studies of documented proof of the effects of natural light.

Wal-Mart (to your surprise) has discovered great value in natural daylight. Beyond the energy savings, Wal-Mart discovered an additional benefit. In their Lawrence, Kansas store, they found (possibly by accident) sales in the daylit portion were twice that of the artificially lit portion. They also found the cash registers that extended under the daylit portion rang in twice as many sales as the artificially lit ones. More information is available on the Wal-Mart Web site.

Of course, simply adding windows to a building is not enough, light brings with it potential heat and glare. A good architect knows how to control, diffuse and use light to create a healthy and comfortable indoor environment.

Image via sxc.hu, Steve Woods

I'm one of those people who suffers bad from seasonal affective disorder. In the summertime I can go on very little sleep and always feel great. In the winter I can hardly stay awake an hour after the sun goes down, which is only about 5:00 PM here in Michigan. It's like I run on sunlight. When I don't get enough I'm a totally different person.

As a "light person" I tend to like really bright rooms. I want all the lights on all the time (which drives my wife nuts). Of course, that can be hard on the wallet and on the planet. I like houses that let the light pour in, which is probably a big part of what draws me to modern homes. But you've got to design for it. Daylighting is an all too often overlooked aspect of home design that makes a huge difference in how the house feels to live in.

The new summer 2007 issue of Innovative Home Magazine has a great article on daylighting called "Here Comes the Sun." It talks about insulated daylighting panels (IDPs) that let in soft light yet don't overheat the house, the good old Solatube, and a slick new take on skylighting, the Parans Solar Panel.