Choose a Light Box With 10,000 Lux of Illumination. Light boxes offering fewer lux are not as effective.

Use a UV Filter. Most light boxes use fluorescent bulbs, which emit a small amount of UV radiation. Your light box should have a UV filter or diffusing screen to protect your skin and eyes.

Opt for Soft, White Lights. Full spectrum lights produce greater amounts of blue light (which can harm the eyes) and UV radiation.