Proof ballast according to the specifications on the model, you can start the 50-400W high pressure mercury lamp, high pressure sodium, metal halide. Working voltage of 220V, according to the needs of different work environment, can be customized to stage IIB or IIC. Protection class IP54 or IP65, which is generally waterproof and dustproof capabilities and high strength waterproof and dustproof capabilities. Also special for the increased safety or non-sparking. The products are aluminum shell material or stainless steel. All gold aluminum material can prevent indoor and outdoor medium corrosion, stainless steel indoor and outdoor strength can prevent corrosion. BAL proof ballast safe and reliable performance, energy saving and environmental protection. Warranty Commitment: One year replacement, three-year warranty.