FIELD: agriculture. SUBSTANCE: device for irradiation of plants in greenhouse has optical radiation source 1 and reflector 8 made of two parts 9 and 10 in form of hollow cylinder whose inner surface is coated with light reflecting material. Stationary part of reflector 8 is secured on rack 5 used for growing of plants 7. Turnable part of reflector is telescopic and is connected with stationary part. Optical radiation source 1 is arranged along axis of reflector 8. EFFECT: reduced specific power of irradiation device, cut down radiation flow losses. 5 cl, 1 dwg
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