The light output is 1800 lumens and you want to know how bright it is compared to an old halogen torchiere.
Led lamp 4000 lumens.
The power p in watts w is equal to the luminous flux φ v in lumens lm divided by the luminous efficacy η in lumens per watt lm w.
In the calculator you have to select lumens to watts as conversion type enter the value 1800 and select the item halogen lamp as comparison type.
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You see an offer for an led torchiere.
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To achieve the same light output of a 60w conventional bulb you will need an led lamp with around 800 850 lumens.
After a click on the calculate button you will see the wattage of an equally bright halogen.
Courtesy of lesser architecture.
P w φ v lm η lm w lumens to watts table.
For the average space of 250 square feet you ll need roughly 5 000 lumens as your primary light source 20 lumens x 250 square feet.
So as a result using watts as a guide to brightness is no longer relevant.
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Watts to lumens calculator lumens to watts calculation formula.
More lumens per watt.
As technology improves more lumens will be produced using even less watts i e.
Lumens conventional vs led lamps.