The Horti King 400V 1000W ballast is the newest addition to the Horti range from Highlight Horticulture. A fanless design and air-finned case allow the ballast to run quietly and efficiently. The ballast will run in humidity levels between 10% and 90% and is rated IP20 dust-tight, with good protection. The ballast has built-in protection against short circuits, open loop circuits, ignition failure and lamp failure. The dimmable function allows the ballast to be run at different power levels to allow for heat and light control of your growing area and also includes a power boost function for better results in the last few weeks of the growing cycle.