The wattage you need is determined by the volume of lights along with the wattage of every light-weight. To determine the wattage you will need, add the wattage of each of the lights you would like to use. This offers you the entire wattage you may need. John Oct thirty, https://www.pixnet.net/pcard/786056405c1fcea80d/article/81c86b20-bf19-11ed-9894-57057db1e320?utm_source=PIXNET&utm_medium=pcard_article&utm_content=786056405c1fcea80d