The Convex LED Lamp is 18 watts but converts this output to 20 mW/cm2 (Millwatt per square centimetre) UV light intensity. This makes it much more energy efficient than most other curing lamps.
Remember, the wattage is just what the lamp pulls in; it's what it emits that’s the most important in curing. A nail lamp can have very high watts, but if it's not emitting enough light, it could mean your gel polish isn't curing correctly.