Intensity:The intensity of the light box is recorded in lux, which is a measure of the amount of light you receive. For SAD, the typical recommendation is to use a 10,000-lux light box at a distance of about 16 to 24 inches (41 to 61 centimeters) from your face.
Duration:With a 10,000-lux light box, light therapy typically involves daily sessions of about 20 to 30 minutes. Check the manufacturer’s guidelines and follow your doctor’s instructions. He or she may suggest you start with shorter sessions and gradually increase the time.
Timing :For most people, light therapy is most effective when it’s done early in the morning, after you first wake up. Your doctor can help you determine the light therapy schedule that works best.
Light therapy is used as a treatment for several conditions, including:
SAD.
Types of depression that don’t occur seasonally.
Jet lag.
Sleep disorders.
Adjusting to a nighttime work schedule.
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