Understanding a light box

A light therapy box mimics outdoor light. Researchers believe this type of light causes a chemical change in the brain that lifts your mood and eases other symptoms of SAD.

Generally, the light box should:

• Provide an exposure to 10,000 lux of light
• Emit as little UV light as possible

Typical recommendations include using the light box:

• Within the first hour of waking up in the morning
• For about 20 to 30 minutes
• At a distance of about 16 to 24 inches (41 to 61 centimeters) from the face
• With eyes open, but not looking directly at the light

Light boxes are designed to be safe and effective, but they aren't approved or regulated by the Food and Drug Administration (FDA) for SAD treatment, so it's important to understand your options.

You can buy a light box without a prescription. Your doctor may recommend a specific light box, but most health insurance plans do not cover the cost.