At present, with the short supply of electric energy, and the increase of domestic consumption, the energy source is in great lacks .So that the energy saving requirement by the state is getting stricter. BESN direct current low pressure sodium ballast, operated in 24V direct current supply, can drive directly the low pressure sodium lamps of 18W、26W、35W、36W、55W、66W、90W、91W. Generally, to drive the vapor discharge lamps and other high efficiency light source, power supply converting gear is indispensable, and the consumption is large. However, BESN electronic low pressure sodium ballast overcomes such disadvantages. solar garden lights : low pressure sodium lamp of 12V , 18W、26W are available. solar sideway lights( 2m-4m in height): low pressure sodium lamp of 24V, 35W、36W are available. solar street lights(5m-8m in height): low pressure sodium lamp of 24V, 55W、66W are available. Solar high mast lights: low pressure sodium lamp of 24V, 90W、91W are available. Tunnel lights: Low pressure sodium lamps from 35W to 90W, direct current or alternating current supply are available