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Compare lumens to watts
Lumen is the term used to describe the total amount of light emitted by a light source, while wattage merely indicates the amount of energy it uses. As lighting becomes more and more energy-efficient, the same number of lumens is being achieved with lower and lower wattages. That's why, when you replace an incandescent bulb with an LED one, for instance, you should compare the number of lumens rather than the wattage to ensure the brightness is the same. The table below clearly shows the number of lumens that are generated by different types of bulbs at various wattages.