Valkee Bright Light Headset. The traditional way to treat the symptoms of SAD is lightbox therapy. However, the experts at Valkee have discovered an alternative. They have developed the first SAD light technology that works via the ear canal, through a small device that looks like an MP3 player, and shines the light into the ears via earbuds. And buy this Valkee Bright Light Headset Now £139.45.