For Professionals

Welcome, Colleagues!


The Center for Environmental Therapeutics is delighted to welcome colleagues to, and call your attention to some of our resources that may be of specific interest.

Welcome to the newly designed Center for Environmental Therapeutics website. A description of key sections of our website, with links, follows. Please don’t forget to bookmark our homepage and check back often for updates.

For Professionals
For Everyone

Upcoming Events

Daylight Awareness Week 2023 is from 13 to 17 November

Daylight and us: learning from the past?

Registration for these events is now open and is free:

Webinar “The Sun and us: ancient times and traditional knowledge”
Monday, 13 November 2023, 17:00-18:30 CET

Register now

6th edition of the deLIGHTed Talks “History of Good Light – Beyond the Visual Spectrum”Wednesday, 15 November 2023, 15:00-16:30 CET

Register now

Online discussion “Solar energy: the test of time and politics” (inspired by the documentary “A Road Not Taken”, followed by a discussion)Thursday, 16 November 2023, 18:00-18:45 CET

Register now

Check back soon for more events.

Check back soon for more events

More than a million people have taken one or more of our three confidential automated online self-assessments. Your clients and patients can take the self-assessments on their own, and share their printed results with you to help you assess and monitor their depression, choose the best time of day to begin light therapy, if light therapy is indicated, and much more.

This collection of assessment instruments, designed and produced by the Clinical Chronobiology and Biometrics Research groups at Columbia University/New York State Psychiatric Institute, is available as a set at CET. See the tools we have found useful in working with affective disorders and sleep problems.

A respected group of clinicians and researchers write for on progress and directions in chronotherapeutics and allied sciences.

A curated collection of seminal papers and books gives an overview of major topics in the research, and application, of circadian science.

Our suggestions range from manuals offering step-by-step guidance for chronotherapy to reflections on the evolution of circadian rhythms within the cycle of day and night.

CET: Past, present and future.

Internal Clock, Circadian Rhythm, Chronotype, Chronotherapy, Seasonal Affective Disorder
Are some of these words or ideas new to you?
If you answer Yes, click here for a friendly way to get started on our site!

Here you will find a vast library of questions asked by other visitors, and their answers from team of experts. Have a question not already listed? Here is your opportunity to ask.

More than a million people have taken our three confidential Automated Online Self-Assessments. Take one (or all) of them and share the results with your doctor or therapist. Results can guide treatment decisions, such as choosing the best time of day for an individual to begin light therapy.

CET bloggers Michael Terman, Dan Oren, Ian McMahan and Abigail Strubel contribute their wisdom here.

Subscribe to our unique, free e-book series, an ever-growing collection with detailed practical guidance spanning infancy to old age, light versus darkness, melatonin administration, and much more.

Prominent researchers and clinicians write for CET about the latest news from their research and clinical practice – a unique, readable collection! Also included, CET articles with practical guidance for treatment.

Our suggestions range from a drug-free program to improve sleep, mood and energy to explanations of the circadian clock.

Journal Watch
CET researchers scan the journals as soon as new issues are published and recommend the best in environmental therapeutics for our visitors to ponder.

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