Buying guide
Light Therapy Lamps Buying Guide (2027)
How to choose a light therapy lamp in 2027: 10,000 lux verification, screen size, UV safety, timing protocol, and who should consult a doctor first.
The 10,000-lux rule
Light therapy dosing is built on 10,000 lux for 20 to 30 minutes. This is the intensity used in the clinical trials, and it is non-negotiable: a lamp advertising 2,500 lux would need 2 hours to match the dose, which nobody sustains. Verify the manufacturer documents 10,000 lux at a stated distance, typically 16 to 24 inches. Vague brightness claims without a lux figure and distance are disqualifying.
Screen size and the inverse square law
Light intensity falls with the square of distance: move twice as far, get a quarter of the lux. Large screens (Carex box) maintain therapeutic intensity across a forgiving area; slim panels (Verilux) require disciplined close positioning. If you multitask during sessions, reading or eating breakfast, prioritize screen size. If you sit still and close, a slim panel suffices.
UV filtering is mandatory
Every lamp in this guide is UV-free or UV-filtered, and yours must be too. Bright-light therapy requires UV blocking because the intensities involved would otherwise risk eye and skin damage over months of use. Never buy a therapy lamp that does not explicitly document UV filtering. This is a safety floor, not a feature.
Timing is the therapy
The protocol: within an hour of waking, 20 to 30 minutes, eyes open, lamp 16 to 24 inches away and slightly off-center. Morning light suppresses melatonin and anchors circadian rhythm; evening light does the opposite and will harm sleep. A built-in timer (Lumos 2.0, Erligpowht) automates compliance. And the medical note: bipolar disorder, retinal conditions, and photosensitizing medications all warrant clinician guidance before starting.
Start with our top 3
The three highest-ranked products in our full light therapy lamps ranking. Read the in-depth review where one exists, or jump to the product in the ranked list.
Verilux HappyLight Lumi Plus
The popular 10,000-lux lamp with a slim profile.
- Light intensity: 10,000 lux
- Light type: Full-spectrum LED, UV-free
Carex Day-Light Classic Plus
The clinical-style box with the biggest light field here.
- Light intensity: 10,000 lux
- Light type: Full-spectrum, UV-filtered
Circadian Optics Lumos 2.0
10,000 lux with 3 color temperatures and a timer.
- Light intensity: 10,000 lux
- Color temperatures: 3 (white to warm amber)
Questions, answered
How much should I spend on a light therapy lamp?
The therapeutic dose, 10,000 lux UV-free, is available at budget prices. Pay more for larger screens (dose forgiveness), timers (compliance), and brand track record. Do not pay more for lux beyond 10,000; it adds no proven benefit.
Can light therapy replace antidepressants?
No, and it should not be framed that way. Light therapy is an evidence-backed treatment for seasonal affective disorder, often used alongside other treatments. Discuss your full treatment plan with a clinician; do not adjust medication based on a lamp purchase.
Do sunrise alarm clocks count as light therapy?
No. Dawn simulators ease waking but do not deliver 10,000 lux or the sustained bright-light dose. They are pleasant accessories, not therapy devices.
When should I start using it each year?
Start in early fall when you notice symptoms returning, rather than waiting for deep winter. Many users begin in October and continue through March. Consistency from the start beats rescue attempts mid-winter.