Application of low pressure sodium lamp in solar lighting system:

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.

Solar energy, an environment friendly energy source, is highly promoted by the state. Wrangler Limited 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 vapour discharge lamps and other high efficiency light source, power supply converting gear is indispensable, and the consumption is large. However, Wrangler Limited electronic low pressure sodium ballast overcomes such disadvantages. Thus, in solar lighting system, it insures the best illumination from the most efficient light source .It also extends the lighting hours, and lowers the cost of the lighting system.

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 lamp from 35W to 90W, direct current or alternating current supply are available.

Low pressure sodium lamp is high in efficiency (200lm/W), long in lifespan, and can seldom be affected by ambient temperature. It is the optimum light source and appliance system to match the solar lighting system. We can manufacture customized electronic low pressure sodium ballast( dimmable ). The light is dimmable according to environment lighting requirement. Thus the electricity output from the battery pile is greatly saved, while the lighting hours extended, the system cost lowered. It accelerates the development of solar lighting system in China, and brings profit to our customers as well as making contribution to China environment friendly lighting project.

Application of low pressure sodium lamp in street lighting:

At present, high pressure sodium lamp is the main light source in street and square lighting system. Mostly, magnetic ballast is used in these lighting systems.
Take the most widely used 250W high pressure sodium lamp in street lighting, as an example (supposing that a street is installed with 100 lamps, and each operates for 10 hours everyday)

The output power of magnetic ballast fluctuates from the voltage of power supply. While for electronic ballast, in the voltage of 160V-260V, it is constant in power output. Therefore, in practical application, the electricity consumption of magnetic ballast is 10% more than electronic ballast.

According to the above data, if we use 180W low pressure sodium lamp to replace 250W high pressure sodium lamp, the luminance of each lamp increases by 5500LM,and the luminous flux of the whole street increases by 550000LM.
The electricity consumption is reduced by 95KW-hour/day*365days= 34675KW-hour. Thus the electricity energy saved each year is 34675KW-hour.

The energy saving effect is more distinct if the voltage of power supply network fluctuates greatly, and the electricity saved is increased by 10%-20%

Application of low pressure sodium lamp in tunnel lighting

At present, 70W,100W high pressure sodium lamp are broadly used as main light source (fixed light)in tunnel lighting system. Take a tunnel with 400 lamps as an example, and suppose that the following light source operates for 24 hours each day.