d92cb313_u__Seoul___Patent_applications__Description
[Patent application number] 20130077303 [Published] 03-28-2013 [Description] 
LIGHTING DEVICE - A lighting device including: a light-emitting device unit including one or more light-emitting devices; a first reflector which faces the light-emitting device unit and reflects light emitted from the light-emitting device unit; and a second reflector which faces the first reflector and reflects light reflected by the first reflector.
Yu, Seoul - Patent applications