What is the measure of a lamp's efficiency?

The measure of a lamp's efficiency is represented by lumens per watt. This metric indicates how much light (in lumens) is produced for each watt of electrical power consumed. A higher lumens per watt ratio signifies a more efficient lamp, as it means more light output for less energy input. This measure is crucial for comparing the efficiency of different lighting options, such as incandescent bulbs versus LED bulbs, as it allows consumers to understand which lighting solution provides greater illumination while minimizing energy costs. The effectiveness of lighting solutions is evaluated based on this measure, making it essential for those looking to enhance energy efficiency in their environments.