This can lead to the following scenarios: If two light sources have the same lumen value but one light source has a higher candela value, it means that the light source has a higher intensity of light in a specific direction. An interesting fact about candela is that it is also referred to as candlepower, and an actual candle has a very appropriate candela rating. The key distinction between lumens and candela lies in that lumens represent the total visible light output, while candela represents the output or intensity of light in a particular direction. CandelaĬandela (Cd) is a unit used to measure the intensity of a light source in a specific direction, typically used to describe the intensity of spotlights or directional light sources. Lux is, therefore, an excellent method for measuring light quality. Conversely, lights like floodlights, which have a wider beam angle, may have lower lux values, not because their light quality is poorer but because their design purpose is to spread light over a wider area. This would result in a high lux value, indicating that the light is projected over a long distance. Then, measure the lux output within one square meter on that wall.Īs an example, consider a spotlight with a very concentrated beam, having a very bright focal point. For instance, take a single light source and project its light onto a wall while ensuring a distance of 10 meters between them. Lux is often measured within one square meter on a wall at a distance of 10 meters. Lux is at the opposite end of the spectrum from lumens and refers to the actual amount of light reaching a surface from a specified distance. It represents the intensity of light from a light source that falls on a surface at a certain distance, typically used to describe the level of illumination. Lux is a unit used to measure the illuminance on a specific area. For example, two lights with the same lumen output may have differences in electrical efficiency, lens clarity, and the size and geometry of reflectors, resulting in different outputs. The lumen rating is merely a measurement of the raw potential of light and does not take into account any other factors in the design and engineering of light, such as the geometry and size of reflectors, the clarity of lenses, and various other factors. This figure is typically provided by the manufacturer of the LED chip itself, such as Cree, Philips, or Osram. It is used to describe the brightness of light. Lumen is a unit used to measure the total light output or radiant power of a light source, representing the total amount of visible light emitted by the source. Whether you're a lighting enthusiast or someone simply curious about the science behind light, this blog will tell you what Lumens, Lux, and Candela are and the differences between them. In short, they are all independent standards for measuring different lighting effects. You have to wonder why no one uses the same system to measure these things and can make best guesses about other car lights. When you're picking out a light bulb or headlight for your car, one lamp description says lumens, another says lux, and the last one says candela. Yet, have you ever wondered how we measure and quantify light? This is where lumens, lux, and candela come into the spotlight. Lighting plays a fundamental role in our lives, from brightening up our homes to guiding us safely on the road.
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