... ,Features1.The shell is sealed ,with performances of water-proof dust-poof ,corrosion-proof .2.The lampshade ... circuit and open-cicuit ,to the phenomenon of lamp's olding effect and gas-leakage,which suits ... protection electro circuit so as to make the lamp to work ordinarily ,and high-efficiency save-energy ... installed as required ,in case of power absence,lamp can be self-switched on.5.Suitable for ...