If you are suffering from a seasonal affective disorder you should try a light box or light visor, which is similar to the tennis visor and not that much heavier, these have a powerful little battery powered light unit in the brim. They are similar to those worn by astronauts in an international space station. You can potter about the house wearing them or they can be worn on aero plane journeys. Outside in’s solarmax visor is as effective as a bulky 10,000 lux light box and provides 100 times the amount of light you’d get in the average home.