Light boxes are the gold standard for SAD — they deliver 10,000 lux of white light, mimicking outdoor sunlight. Desk lamps are weaker (2,000‑5,000 lux) but more convenient. The light therapy market forecast shows that light boxes hold the largest share, but floor and desk lamps are the fastest‑growing. Why? Because people want therapy that blends into their home decor.

What's the evidence? A 10,000 lux light box for 30 minutes each morning is as effective as antidepressants for mild‑to‑moderate SAD. The light therapy market analysis notes that the fastest‑growing light type is white light, used for circadian rhythm disorders and sleep regulation.

But not all light boxes are equal. Look for one that filters out UV (which damages skin) and has a diffuser (to reduce glare).

The bottom line: if you have SAD, invest in a proper light box. A desk lamp is better than nothing, but it may not be enough.