FIELD: lighting engineering. SUBSTANCE: mercury gaseous discharge lamp for irradiation of plants in hothouse has optical transparent envelope, hermetically sealed electrodes and metal halogen filler. According to invention, from 5 to 85 mass % of metal halogen filler are in grains with enclosure containing high-melting oxides, or nitrides, or carbides or mixes based these elements. EFFECT: enlarged operating capabilities. 5 cl, 3 dwg
