PROTECTED LIGHT Russian patent published in 1997 - IPC

FIELD: lighting engineering. SUBSTANCE: device includes housing with cover and reinforced protective cover slightly projecting above cover, light source, coordinate cylindrical mirror reflector forming optical system with focal line on which above-mentioned light source lies. Reflector is provided with two central and two peripheral concave zones whose profile is made in form of two pairs of ellipses symmetrically oriented relative to source of light and engageable together. These pairs of ellipses form two ellipsoid cylindrical zones with first focus located on single focal line and three or four second focuses which do not coincide relative to one another; they are located in space between outlet of reflector and cover glass near its inner walls. EFFECT: enhanced efficiency. 3 cl, 4 dwg