... high-pressure sodium lamps, halogen lamps, xenon lamps, pole-free lamps, energy-saving lamps, LED, etc.Daily service ... cell, service life≥25 yearsStorage battery: valve-controlled sealed maintenance-free colloid silicon lead acid storage battery , service life ... service life ≥5 yearsBattery box: injection-molded, fully sealed and waterproof, high performances in heat preservation, service life ...