UV light purifiers vary in energy efficiency, depending largely on the design and the specific application. Typically, these devices consume a moderate amount of electricity, comparable to a small household appliance. Residential models can be quite energy efficient, often using as little energy as a standard light bulb (around 15 to 60 watts). Industrial models may require more power due to their larger scale. It’s important to compare the energy consumption details provided by manufacturers and consider energy-efficient models that offer features like automatic shutoff or energy-saving modes to optimize power usage.