The simple Answer is to bring natural sunlight into your home or office space. By installing a solar tube, also known as solar light tube, solar skylight tubes, and sun tunnels you can have the benefits of sunlight with the bad side effects. This isn't artificial light it is natural sun light.  Sunlight that our bodies need crave.

They have done the research and there is a cure for SAD.

I could talk more about this but I just want to say if your experiencing any of the symptoms such as depression, slow sluggishness, just lack of enthusiasm for your life or your job it would definitely worth installing these solar tubes above your work station or in your home office. Anywhere that you can spend some time enjoying the natural sunlight and absorbing its benefits. The specially designed lens does not bring in any heat and the reflective material allows for tons of light.
Solar tubes are now even being used as solar grow tubes. Plants are benefiting from this natural sunlight light which is also the best light for growing.

Some doctors prescribe sitting in an artificial light to correct this disorder but sunlight really is the best light.  Artificial light is better and does help but sunlight without the bad effects of sun exposure is ideal and perferred.

For more info on SAD and the treatment click here.