MILLIARD Fluorescent Grow Lights are just what any indoor gardener needs to bathe their plants in sunlight so they can grow quickly and healthy. However, different plants have different needs, so our Grow Light Ballast Kit includes everything you need to tailor your lighting for the best growing conditions for your garden. Engineered for use with our MILLIARD Reflective Hydroponic Grow Tent and its accessories, the ballast in the Grow Light Ballast Kit features a variable output that will adjust from 50% to 75% or 100% power. Also included is a High Pressure Sodium (HPS) bulb that gives off a warming, yellow light and a Metal-halide (MH) bulb that throws a wide-spectrum white light for more general purposes. To get started, just install the desired light bulb in the included Gull Wing deflector, hang the deflector to the necessary height with the included adjustable hangers, plug it into the ballast and set it to the desired brightness. The Grow Light will do the rest! The MILLIARD 400W Grow Light Ballast Kit has been carefully manufactured with function and safety in mind and its durable construction should provide years of satisfaction with proper use.