A reader asks:

There is one brand of light box out there that combines light and ions. Would that be overkill? Could one somehow get “too much of a good thing” by combining the therapies?

Answer:

We strongly advise against using that device. The combination has never been tested in clinical trials, and there could even be negative effects. Moreover, the design of that apparatus may be inherently faulty, since negative air ions flow to the best “earth ground,” which in this case is probably the light box itself. Not to mention that the lamps lack an adequate diffusing filter, and direct light upwards into the eyes (glaring “ski slope effect”). The supplier of this apparatus had acted irresponsibly in selling this device to depressed people.