FIELD: lighting engineering. SUBSTANCE: given lighting unit includes waveguide to transmit radiation of superhigh frequency range formed in magnetron, gauze screen placed across waveguide output to block radiation of superhigh frequency range and transmit luminous radiation, bulb located in gauze screen to emit luminous radiation of superhigh frequency range, dielectric mirror with curvature specified in advance to reflect luminous radiation emitted in bulb and reflector positioned around gauze screen for outward reflection of luminous radiation emitted in bulb. Reflector and dielectric mirror are so placed that they jointly form parabola and mentioned above bulb is located in focus of parabola formed by mirror and reflector. EFFECT: prolonged service life and enhanced efficiency of lighting unit. 3 cl, 4 dwg
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