Sunlight Supply enclosed ballast systems come assembled and ready to use. Just add the lamp, plug it in and you're ready to go. Enclosed plant grow lights come in 150 to 400 watt HID and fluorescent. Fluorescent systems are great for use in starting your plants, they also have a very low heat factor which allows the fixture to be hung very close to plant canopy, thus raising light levels. Use a MH for use in the vegetation stage and an HPS for flowering. They feature a light-weight, rust proof aluminum body, major brand ballast 2-5 year warranty.