Manufacturer's Description:
Patent Pending Dark Sky cup fits over the lamp to give ambient down light. Used with one-light medium base lamp facing down only. Shield to convert most wall & chain hunglanterns to a sky friendly fixture - When installed no light is emitted above45 degrees - For A19 lamps mounted in a downwardposition (base up) - Available to match most lantern finishes. Mounting - A high heat gasket is affixed to the topof the shield which slides over the baseof the lamp - Lamp and shield are installed as a unitOther - Patent Pending