FIELD: lighting engineering. SUBSTANCE: proposed lighting unit includes lamp emitting light with supply of electric current from external network and fan connected to motor for suction of outer air with rotation of fan to cool lamp. When amount of dust determined with the use of dust trap is above specified level in the course of preset time period lamp switches off to prevent its overheating as result of failure of fan to avoid possible failure of lighting unit and inadvertent fire. EFFECT: enhanced operational reliability of lamp. 5 cl, 6 dwg
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