Electronic high pressure sodium ballast AC(220V,35W-750W) AC(110V,70W-400W) Features: Adopting power factor correction and electron filter technology, the power factor of the whole lighting system is improved to above 99%, little ballast consumption. Lighting efficiency is improved by 10%, energy saved by 30%.Current supply is only 1/3 of magnetic ballast. To ignite the bulb, the high frequency constant power technology solves the problem of sound frequency resonance. Multi-protection of the bulbs Application: for high pressure sodium lamps or lighting fixtures in: horticulture lighting, aquatic lighting, highway lighting, street lighting, area lighting ◇ It improves the quality of electricity , and saves the electrical energy. ◇ It reduces the cost of installation and operation ◇ It stabilizes the light, and improve the lighting quality. ◇ It is compatible for a wide ranges of power supply. ◇ The startup of bulb is fast, and the bulb life-span is extended. ◇ Multi-protection function insures its high safety. ◇ Small size, light weight, convenient for installation.