10 square meters? Well, the illuminance or lux would decrease to a less intense and dimmer 100 lux. But what if we spread this over 10x the area i.e. If all of those 1,000 lumens are spread over a surface area of 1 square meter, you’d have an illuminance of 1,000 lux – i.e. So let’s say you have a light source with 1,000 lumens. Lux is simply the unit of measure used to describe the number of lumens falling on a square foot (footcandles) or square meter (lux) of a surface. Which moves us onto illuminance (footcandles / lux). Now, lumens are simply a unit of light, but when put into context over a given surface area, they become especially a more useful metric. By understanding lumens, we can explore other lighting metrics such as illuminance (footcandles/lux) and how this plays a key role in assessing the intensity of a light source.Ī light source, like an incandescent bulb for example, emits light in all directions, of which the total measurement is displayed as luminous flux (something we’ll get to shortly). When you purchase light bulbs based on their intensity or brightness, it is lumens you‘re after, not watts – watts simply determine a bulb’s energy consumption. The higher the lumen output, the ‘brighter’ or higher intensity the light source the lower the lumen output, the less bright or lower intensity the light source. You many have noticed when you buy light bulbs for your house that they indicate lumen output. The luminous flux of a particular light source is measured in lumens. Lumens (lm) are the unit of measurement we use to quantify the amount of visible light the human eye can see. It is common to get these two confused by definition or simply using one inaccurately in place of the other – so let’s iron this out. Now let’s look deeper at how we measure illuminance – We start by looking at the two fundamental lighting units of measure: lumens and illuminance (footcandles/lux). Measuring the amount of light that falls on a surface allows us to evaluate if we have sufficient light to perform various visual tasks. Therefore, light intensity is measured in terms of lumens per square foot (footcandles) or lumens per square meter (lux). It is measured in footcandles or lux – it is the amount of light (lumens) falling on a surface (over any given square foot or square meter). Illuminance is the metric that is used to measure the light intensity within a space. What is the Best Metric to Measure Light Intensity? This article will cover a few basic principles related to light intensity – how to measure light intensity, the difference is between lumens and illuminance (and what they mean), plus we will discuss the ways in which artificial light has become so critical to our daily lives and well-being. Shop for Architectural Lighting Solutions by BIOS It is especially useful to understand light intensity in order to properly evaluate whether or not a space has adequate lighting conditions. The lighting industry has well-established light level recommendations for a wide range of applications and space types. In architectural lighting, light intensity or light output is measured to understand whether a particular light source provides enough light for an intended application.
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