what's the meaning of "Deep Light shelves direct light into the work space"?

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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

Answer

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.