EYE HORTILUX Ballast provides a consistent power supply to your grow lamps. This allows your HORTILUX grow lamps to do what they were designed to do, which is, provide a quality light spectrum for your garden. Grow lamps are responsible for providing quality light to your garden. Ballasts are responsible for providing the power to your grow lamp. Gold Series e-Ballast - provide consistent, stable power to the lamp for high intensity and a quality spectrum.