The light itself isn't the color green, but it's certainly less likely to put you in the poorhouse via electricity bills. This is the Pure Sun lamp designed by Denmark-based Igland Design who've billed this object as "a table that doubles as a light source, using only the sun. Well wait a second, couldn't I just open a window? Yes you do have to open a window. Isn't the room then already light? Not if you've got a small window. This seems difficult. It is!