Most of the equipment referred to by your questioners, as well as that sold for depression treatment, uses fluorescent tubes. Have incandescent sources been...

A reader asks: Most of the equipment referred to by your questioners, as well as that sold for depression treatment, uses fluorescent tubes. Have incandescent...

In dawn/dusk simulation therapy, how important is the dusk simulation part? Also, can dusk simulation be successful even if used at different times in...

A reader asks: In dawn/dusk simulation therapy, how important is the dusk simulation part? Also, can dusk simulation be successful even if used at different...

I have been suffering from chronic insomnia for several years. I have seen every doctor and tried every medication (both prescription and herb) imaginable...

A reader asks: I have been suffering from chronic insomnia for several years. I have seen every doctor and tried every medication (both prescription and...

I’m using a light box (10,000 lux) for 30 minutes at 7:30 each morning for depression and to help me get up at a...

A reader asks:  I'm using a light box (10,000 lux) for 30 minutes at 7:30 each morning for depression and to help me get up...

I have recurrent ocular herpes for which I take Valtrex every day. Are there any concerns that light box therapy can exacerbate it?

A reader asks: I have recurrent ocular herpes for which I take Valtrex every day. Are there any concerns that light box therapy can exacerbate...

There is one brand of light box out there that combines light and ions. Would that be overkill? Could one somehow get “too much...

A reader asks: There is one brand of light box out there that combines light and ions. Would that be overkill? Could one somehow get...

In answer to another person’s question, you said, “Waking up to bright morning light, whether from outdoors or timed artificial light sources, is far...

A reader asks: In answer to another person's question, you said, "Waking up to bright morning light, whether from outdoors or timed artificial light sources,...

Do most people respond to light therapy even at the “right time” for phase advances or delays? Does it need to be done at...

A reader asks:  Do most people respond to light therapy even at the "right time" for phase advances or delays? Does it need to be...

How do the lights work?

A reader asks: How do the lights work? Answer: Scientists are still investigating the precise mechanism that makes light therapy effective. Thus far, we believe that bright...

I suffer from panic disorder. I used a light box for four days for 30 minutes starting at 6:30 a.m. On the fourth day...

A reader asks: I suffer from panic disorder. I used a light box for four days for 30 minutes starting at 6:30 a.m. On the...