Lumen is the standard unit of measure for the total amount of light from a source, in all directions.
This tells you how much light the torch produces, with no regard for the area, unlike Lux. This is demonstrated by the example below:
1000 Lumens concentrated into an area of 1-meter square, would equal 1000 Lux
BUT
1000 Lumens spread over 10 square meters, equals only 100 Lux
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