Most people use a special light box with a brightness of 10,000 lux for about 30 minutes each morning. This type of light doesn’t include UV rays, so it’s safe for the skin and eyes.

Some light boxes stand independently, but newer technology has integrated the therapy into eyeglasses. Light boxes are meant to generate a standard wavelength and amount of light.

A UV light box costs about $2,000, whereas adalimumab (Humira), a leading biologic drug for various autoimmune diseases, lists for $80,000 a year and must be taken for life.