The most important features that should be seen when purchasing a light therapy lamp are the intensity of light and the type of light emitted. Research supports the use of a sad lamp with up to 10,000 lux as a treatment for depression.
Another key is that you do not want a sunlight lamp that is emitted from UV rays, as it can cause damage to your eyes and skin. Although it is not supposed to stare directly on a mild treatment lamp, you still do not want to expose yourself to the daily radiation of UV rays while trying to treat seasonal depression.
The size is important, somewhat. The larger light plate allows you to put the light away while using it, so this is considering when shopping. The smaller lamp should be closer to your face and give it at the level of your eyes. You may need to spend up to an hour every day using a small sad light, but only half of that with a larger lamp.
as May clinic Note, “The effectiveness of the light box depends on daily use, so buy one suitable for you.”