I am glad to introduce ourselves here. We are the leading supplier of the electronic ballast of low pressure sodium lamp, high pressure sodium lamp and metal halide lamp with DC power input in China. 

It is perfect for solar power of street lighting.

We also have the reducing power consumption models. They can reduce the lamp power consumption 30% down in the late night. This will cut sharply the cost of solar panel and battery.

Hope it is what you are looking for if you have the needs in this realm.

Thank you for your time and attention !