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Lumen is standard unit of light as it is perceived by the human eye. Essentially, it will tell you how bright something is, unlike a watt, which is actually a measurement of energy consumption or output.
The lighting industry has standardized ways that it measures the total emission of light from a product and include it on most packaging.
Because the Lumen output from different manufactures will vary
Here's a quick and easy guide to approximate total Lumen output.