Web Hydroponics has digital ballasts like the Cali Ballast and the UltraGrow E Ballast in stock and ready to ship today. Every grower needs a ballast to operate the grow lights in their grow room. Most ballasts will power either your High Pressure Sodium (HPS) or Metal Halide (MH) bulbs but in some cases you can utilize a ballast that can power both. Our favorite ballast is currently the Cali Ballast because it is dimmable which gives you more control over the bulbs in your grow room. We’re growers ourselves so every product we carry we’ve used at some point so if you have any questions about any of the items you see below, please give us a call toll-free at 888-WEB-HYDRO and we’d be happy to help you find the right product or answer any questions! At Web Hydroponics, every order over $100.00 will always receive free same day shipping and expedited shipping options are available!