Manager Shen of Shanghai Qichang introduced the characters of this kind lamp: if one inner tank broken ,another one continue to work, which applied to places of not easy to repair , such as roadway, airport ,islands, seaport, station and so on.

 

Manager Shen demonstrated Double-tube high-pressure sodium lamp.

 

It is the first time for foreign merchants to see there are two inner tanks with circling usage in a lamp tube

 

Foreign merchants were very interested in ,through research to carry out cooperation