Our LED light strips vary between 24 and 72 watt power requirements. Every strip on the site has its wattage listed. When selecting a power adapter, simply add up the combined wattage you need for all of your strips! The watts required are also proportional to the length of the strip you are using. For example, using 1 foot of our 16.4 ft., 72 W spools will draw roughly 1/16th of 72W, or 4.5W.