lumen
n. countablen. a unit that measures the total amount of light coming from a source like a bulb. The higher the number, the brighter the light looks to your eyes.
n. the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.
This LED bulb produces 800 lumens of light.
When shopping for energy-efficient lighting, consumers should compare lumens to determine brightness rather than relying on wattage.
The architectural lighting plan specified a minimum of five hundred lumens per square metre to ensure the workspace remained functional during the winter months when natural light is scarce.
Commonly used in the plural when describing the output of lamps or digital projectors.
This bulb has 60 watts of brightnessThis bulb has 800 lumens of brightnessWatts measure power consumption, while lumens measure the actual light output or brightness.