Lumens are the unit of measurement for the amount of light a light source emits (known as luminance). This is the most common metric when comparing lighting products or estimating the suitability of a light for a particular application, however, with the correct application of precision optics this is not necessarily a fair way to compare products. It is important that you ensure it is luminaire (or fitting) output rather than chip output you are checking when comparing products to ensure that it is representative of the product - depending on lenses/diffusers etc, there can be a fairly significant step down from chip output to luminaire output.
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