SAD can be used to describe a multitude of symptoms stemming from a general lack of sunlight that most people experience during the winter months when some people can get as little as 7 hours of sunlight. These symptoms can be even worse for people with office jobs. To help alleviate the symptoms of seasonal affective disorder, the Mayo Clinic recommends a lightbox that projects a minimum of 10,000 lux, the relative equivalent to exposure to full daylight. Unfortunately, even the brightest LED bulbs fall far short of that mark at around 500 lux.