What is a measurement of raw light known as?

The measurement of raw light is referred to as lumens. Lumens quantify the total amount of visible light emitted by a source. This unit captures the intensity of light output that is perceivable to the human eye, making it particularly relevant in the context of lighting applications.

In terms of illumination assessment, lumens help to determine the brightness of light sources like bulbs or fixtures. The higher the lumen rating, the brighter the light will appear. This is crucial when designing roadway lighting or traffic signal systems to ensure adequate visibility for safety and effective communication to drivers and pedestrians.

Other options have specific purposes that are not synonymous with the concept of "raw light." Watts measure electrical power consumption rather than light output, candelas refer to luminous intensity in a specific direction, while kelvins indicate the color temperature of light. These distinctions illustrate why lumens are the appropriate choice for measuring raw light.