Lighting for the book stacks in the West Berkeley Public Library comes from built-in energy efficient light fixtures above the stacks rather than relying on general ambient lighting. (Photo by Mark Luthringer)

Lighting for the book stacks in the West Berkeley Public Library comes from built-in energy efficient light fixtures above the stacks rather than relying on general ambient lighting. (Photo by Mark Luthringer)

Lighting for the book stacks in the West Berkeley Public Library comes from built-in energy efficient light fixtures above the stacks rather than relying on general ambient lighting. (Photo by Mark Luthringer)