What is the energy In of a torch?

The energy input (In) of a torch refers to the amount of electrical energy supplied to it, typically measured in watts or joules. This energy is converted into light and heat when the torch is powered on. The efficiency of this conversion can vary based on the type of bulb used (e.g., incandescent, LED) and the power source. For example, a standard LED torch might use around 3 to 5 watts, while a high-powered torch could consume significantly more.