Finding the right ballast for your fluorescent lighting needs is as important as finding the right bulb. Our HL3-T432-120-1-S Hi-Lume ballast allows you to dim your fluorescent lamp to 1 percent. Each Lutron dimmable ballast comes with a studded case for easy and secure installation. Use a four-pin three-tube T4 lamp with this model. Three tube lamps provide three separate tubes of light in one sleek lamp.