If you happen to be affected by winter blues that results in SAD (Seasonal Affective Disorder) or depressed mood, you need a bright light to perk you up.
Here is a device that serves the purpose.
Feel Bright Light LED Visor is a bright light therapy device. It weighs light and also it is portable. Feel Bright Light LED Visor will help solve all your circadian rhythm problems and increase your concentration and alertness.