Do SAD Lamps Actually Work?
The Wirecutter Show
How Light Therapy Resets Circadian Rhythm
Nancy describes how morning bright light suppresses melatonin and can realign the sleep-wake cycle.
For some people, shorter days and reduced sunlight in the winter can seriously disrupt sleep, mood, and energy levels. A light therapy lamp can help.
In this episode, senior staff writer Nancy Redd explains what seasonal affective disorder (SAD) actually is, how light therapy works, and why not all lamps are created equal. We cover what 10,000 lux means, why timing matters, and why you should talk to a medical professional before trying any.
We also break down the four lamps Wirecutter recommends, and how to choose the right one for your space, budget, and tolerance for clunky design.
This episode covers:
- What Seasonal Affective Disorder really is: SAD is a seasonal pattern of major depressive episodes. It’s more than the “winter blues,” and it’s officially classified as a depressive disorder with a seasonal pattern.
- How light therapy works: Morning exposure to 10,000 lux of bright, UV-free light for about 30 minutes can help realign your circadian rhythm—your body’s internal 24-hour clock that regulates sleep and hormone cycles.
- Why medical guidance matters: Light therapy affects mood and sleep. You should always consult with a medical professional before using a light therapy lamp. People with bipolar disorder, retinal conditions, or who take photosensitizing medications might even be at risk of worsening their conditions with a light therapy lamp.
- Why regular lamps won’t cut it: A typical household bulb doesn’t deliver the intensity or the controlled light output required for therapeutic use.
- How to choose the right lamp: Size, brightness distance, UV filtering, heat output, and positioning all matter more than you might think.
Products we recommend:
- The best light-therapy lamp: Carex Day-Light Elite
- Compact design and lower price, but less powerful: Verilux HappyLight Luxe
- Best for warmer light: Northern Light Technologies Boxelite
- Best for simulating sunlight: Beurer TL95
Additional reading:
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The Wirecutter Show is executive produced by Rosie Guerin and produced by Abigail Keel.Engineering support from Maddy Masiello and Nick Pitman. Episodes are mixed by Catherine Anderson, Efim Shapiro, Rowan Niemisto, Sophia Lanman, and Sonia Herrero. Original music by Dan Powell, Marion Lozano, Elisheba Ittoop, and Diane Wong. Wirecutter’s deputy publisher and general manager is Cliff Levy. Ben Frumin is Wirecutter’s editor-in-chief. Hosted by Rosie Guerin, Caira Blackwell and Christine Cyr Clisset.
Find edited transcripts for each episode here: The Wirecutter Show Podcast
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