Light Therapy

• Light therapy, effective for treating depression, especially Seasonal

Affective Disorder (SAD), works by regulating the biological clock

through exposure to bright light. To maximize its benefits, sit under

the light box for 1-2 hours a day, positioned 12-17 inches away and

at a 45-degree angle. Morning light is best, as afternoon exposure

can disrupt mood. Results usually take 2-4 weeks but may appear in

just a few days.

• For bipolar depression, light therapy is effective but can occasionally

trigger manic symptoms. To reduce this risk, limit use to midday,

starting with 15 minutes and gradually increasing time each week. If

manic symptoms occur, reduce exposure and consult your provider.

• Start light therapy at least two weeks before expecting a seasonal dip

in mood, and gradually decrease the therapy in spring. Common side

effects include headaches and eye strain, and to protect your eyes,

ensure the box has a UV filter and avoid direct light exposure.

• SAD typically begins between ages 15-30, affecting about 5% of

Americans, with milder forms affecting up to 20%. For those with

bipolar disorder, the increased light in March can trigger mania, so

stopping light therapy in February may be necessary. Using blue-

light filtering glasses in the evening can help reduce this risk.

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