To help his sister who suffers from Seasonal Affective Disorder, Boris Legradic of Letters from Lausanne blog made her a DIY lightbox:
My sister suffers from seasonal affective disorder, also known as winter depression. A commonly prescribed therapy is light therapy - about thirty minutes of bright light in the morning. Bright in this context means more than 10 000 Lumens. You can of course buy commercial light-boxes, but I wanted to construct one by myself...