How do you calculate power usage of led light?

To calculate the power usage of an LED light, you need to know its wattage rating, which is usually indicated on the packaging or the light itself. The power usage can be calculated using the formula: Power (Watts) = Voltage (Volts) × Current (Amperes). For example, if an LED operates at 120 volts and uses 0.5 amps, its power usage would be 60 watts. Additionally, you can estimate energy consumption over time by multiplying the wattage by the number of hours the light is used, converting it to kilowatt-hours (kWh) for utility billing.