The most common light source is a full spectrum fluorescent light. This fixture provides a reflecting surface behind the lights and a plastic diffusing screen in front. The light box is placed either horizontally on a desk or table or vertically on the floor. The intensity of light from this special light source is equivalent to the amount of light exposure the person would receive from looking out a window on a sunny spring day. Side effects of phototherapy are uncommon.
Some patients complain of irritability, eye strain, headaches, or mania.
No evidence has been produced of long- term adverse effects, however. If your symptoms are mild, that is, if they don't interfere too much with your daily living, you may want to try light therapy as described above or experiment with adjusting the light in your surroundings with bright lamps. He or she can help you find the most appropriate treatment for you. Many people with seasonal mood swings seem to gravitate toward sunlight. They also tend to walk around the house turning on lights to alleviate their symptoms.