Mercury bulbs belong to the class of economic energy saving gas-discharge lamps which are generally applied in street and industrial lighting. They have higher level of energy efficiency compared with incandescent bulbs and fluorescent bulbs. Mercury bulbs differ with good luminous efficiency and considerable service life, but don't differ with color rendition. They are mostly used in street lightining, bus stops lightining, manufacure lightining and as additional lightining at greengardens. Using of this lamps considerably reduces expenses on maintenance and operation of streetlights.