A direct-indirect luminaire is provided with a direct light control structure between the luminaire's light source and the down light openings in the luminaire's housing. The down light control structure has an interior light capture which extends to meet the light source and which is shaped to substantially...http://www.google.ca/patents/US5884994?utm_source=gb-gplus-sharePatent US5884994 - Direct-indirect luminaire with improved down light control
