Lumens (lm) are a measure of the amount of visible light that a lamp or other light source emits. It is a much more accurate way of determining a bulb's brightness, as it is a measure of its output, unlike the wattage, which just denotes the power input.
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LED light bulbs for general use around the home will typically have a wattage between 5W-15W, and will emit between 300-500 lumens. Some outdoor floodlights emit in excess of 20,000lm.
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