All Hamilton Metal Halide Systems come with everything you'll need to use them right out of the box. They include all bulbs in a variety of wattage selections, with your choice of 10K, 14K or 20K bulb coloration, electronic ballast(s), and the pendant. Hamilton Metal Halide Lighting Systems are an outstanding choice for Corals, Fish, Anemones and Invertebrates. The difference between Mogul and Double Ended (DE) is that Mogul is a screw in bulb and DE has two ends which slide into the socket. We offer free shipping on all systems. Should you have any questions about which unit is right for you, please contact us.