It's that time of year again, especially in the northern hemisphere where the reduced hours of sunlight have had a noticeable effect on people's health. Officially, seasonal affective disorder or SAD, is caused by lack of photo stimulation of the eye leading to symptoms of slow brainwave activity, depression, anxiety, extreme fatigue, hypersomnia, carbohydrate cravings and weight gain, though taking other factors into consideration, in winter vitamin D is also low which can further add to depression, especially in women. Taking a good supplement definitely helps manage symptoms; however, the typical strategy is to have a "light box" basically a lamp that emit about 10 000 lux of full spectrum lighting.
These types of lights run about $200 aren't portable if you need to travel or take them between the office and home. They are probably only used a couple months of the year due to high energy costs to run them. Also, they only address the photo stimulation issue. Using AVE, a completely portable system, people can use them at their convenience to not only address photo stimulation, but teach the slower brain waves to speed up. The DAVID Delights and Pals have multiple settings for people to use all year round. Research regarding SAD can be found on the site at SAD Study