Electronic metal halide ballast CDM(220V,35W-150W) DH(110V,70-400W/ 220V,35-750W) 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 metal halide lamps or lighting fixtures in: horticulture lighting, aquatic lighting, highway lighting, commercial lighting, area lighting, warehouse lighting, high bay, low bay lighting.