... -15days; 4,System life : > 20 years *Solar Street light Features: 1,high efficient solar panel,monocrystalline silicon.with converstion ... power efficiency and good heat dissipation performance; 4,Intelligent microcomputer controller 5,Ambient temperature: -50- 70 0C ; 6, ... hot dip galvanised plastic spraying. 7,Lamps and lanterns: computer design,die casting aluminum ,plastic spraying, 8,Lighting time ...