Efficiency - Led Light bulbs Buying Guides
Comparing a light bulb’s lumens output to its wattage is the easiest way to determine how efficient it is. Lumens are a measure of how bright the light is, while its wattage denotes how much power it consumes.
The lower the wattage and the higher the lumens output, the more efficient the bulb. Typical LED light bulbs emit around 80-100 lumens per watt, while an incandescent bulb might only give you 40-50 lumens per watt.