Hi This page gives a description (in English) and has a diagram that shows you how a light shelf works: http://www.buildings.com/articles/detail.aspx?contentID=3648

Deep Light shelves direct light into the work space 光线穿过宽宽的 透光板/架 照进工作室. Light shelves有点像窗格子,遮阳板的意思,具体不清楚. 仅供参考. 哪位高手指点一下.