parameters Lamp surface diameter:  Φ300mm ; Φ400mm; 300x300mm; 400x400mm;  500x500mm; 600mmx600mmcolor: red(620-625),green (504-508), yellow (590-595)voltage :187V-253V,50HzRated power: Φ300mm<10w  Φ400mm<20wwork life :50000 hours work environment : -40℃- +70℃Relative humidity: ≤95%Reliability: MTBF>10000 hoursMaintainability: MTTR ≤0.5 hoursProduct Feature:· High efficiency and long life LED light source· Lowest power consumption and brilliant light output· Uniform signal appearance· UV-stabilized Polycarbonate shell and lens· Sun phantom protection· Waterproof and impact resistance· Moisture and dust resistance