BLST Electronic Factory is one of the leading electronic ballast manufacturers in China, founded in 1982. We specialize in Electronic Metal Halide and High Pressure Sodium Lamp Ballasts, along with many other energy efficient lighting products. Our goal is to bring you products of the highest quality and latest technology at the most competitive price. Our products are becoming more and more popular in the North American market due to their high quality and fair pricing. BLST Electronic Factory is a top manufacturer with the ability to design 400W electronic ballasts for Metal Halide and High Pressure Sodium Lamps. If you have questions, please feel free to contact us. Our professional engineering staff and we will provide you with the best service available. We look forward to developing into mutual long term business relationship with potential customers from around the globe. By working together we are confident we can make a brighter world.