Intensity: The intensity of the light box is recorded in lux, which is a measure of the amount of light you receive. For winter blue, the typical recommendation is to use a 10,000-lux light therapy lamp.
Distance: You would hold it at least an arm's distance，about 16 to 24 inches (41 to 61 centimeters) from your face.
Angle of Gaze: To avoid aversive visual glare, the light therapy box should project downward towards the eyes at an angle, at like a 45 degree angle to your eyes.
Duration: You would use it for 15 to 30, or even perhaps 45 minute, intervals or increments, and that would be a session.
Timing: For most people, light therapy is most effective when it's done early in the morning, after you first wake up.