The Hobby is a complete horticultural lighting system, all in one box, just plug in and grow. Each system comes with a PowerPlant Daylite Ballast, a high quality horticultural reflector, a pack of 2 Eazi Rolls to allow for height adjustment, hanging hooks and PowerPlant HPS lamp. Ready to use. Each 250w Hobby system comprises the following: 1 x 250w DayLite ballast 1 x High-quality Eurowing reflector 1 x Twin pack of Easi Rolls for easy height adjustment as your plants grow 2 x Hanging hooks for hanging the reflector 1 x 250w PP HPS lamp (bulb) All supplied with full instructions. Please note you may also require a relay and timer with this system.