In the question on “the mechanism of action of the agitation side effect,” one of your suggestions was to try light later in the...

A reader asks:  In the question on "the mechanism of action of the agitation side effect," one of your suggestions was to try light later...

I am confused. A recent q&a item said that color temperature and spectral output matter. I understood your previous answers to suggest they did...

A reader asks: I am confused. A recent Ask the Experts answer said that color temperature and spectral output matter. I understood your previous answers...

I started using a 10,000 lux light box last fall with dramatically positive results. …

A reader asks:  I started using a 10,000 lux light box last fall with dramatically positive results. Because I felt better during the winter with...

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’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...

My 16-year-old daughter is perpetually tired, even though she sleeps well and gets plenty of it. She goes to bed at 9 at night...

A reader asks:  My 16-year-old daughter is perpetually tired, even though she sleeps well and gets plenty of it. She goes to bed at 9...

 What is your opinion about the safety and efficacy of green light boxes? …

A reader asks:  What is your opinion about the safety and efficacy of green light boxes? A manufacturer cites some research to support the claim...

I bought CET’s recommended light box in early November and can’t even begin to describe what a wonderful addition to my life it has...

A reader asks: I bought CET's recommended light box in early November and can't even begin to describe what a wonderful addition to my life...

Where in my area can I find help planning the schedule I need to treat delayed sleep phase syndrome once I get the lamps?...

A reader asks: Where in my area can I find help planning the schedule I need to treat delayed sleep phase syndrome once I get...

What is the difference between color temperature and the color rendering index (CRI)? Which is more important for light therapy?

A reader asks: What is the difference between color temperature and the color rendering index (CRI)? Which is more important for light therapy? Answer: Color temperature reflects...