Dimmable Electronic Ballast for T8 Fluorescent Lamp. 18,30,36,58W for ONE or TWO lamps 220~240V or 100~120V, 50/60Hz Power factor: 0.6C or 0.99C Start up Mode: Preheating With Abnormally Protection Case type:258*40*32mm or 327*40*32mm We are a factory of electronic transformer,electronic ballast.we can support our products with superior quality and most competitive price. For our products, pls feel free to visit www dqhuaying com,