Lumens are a measure of the total amount of visible light emitted by a light source per unit of time. It is the unit of luminous flux in the International System of Units (SI), and it measures how much light you are getting from a bulb. More lumens mean a brighter light, while fewer lumens mean a dimmer light. When buying light bulbs, it is recommended to compare lumens to ensure you get the desired level of brightness, rather than relying on watts, which measure energy used