signal light (1) Voltage of working frequency:2.5kV( AC valid value), 1min. (2) Insulated resistance ≥ 2MΩ(3) Voltage wave allowed by AC indicator ± 20%(4) Continual working life ≥ 30000h(5) Brightness ≥ 60 cd/m2 (6) Index of leakage CT1 ≥ 100(7) Protection grade is IP40,and it is possible to be made to up to IP67(8) Using frequency: AC50 60 Hz