November 20, 2020

What is the difference between Lux and Lumens

Understanding light brightness


Light comes in many shapes and sizes, so understand light measurement can help you pick a light for your application. There are many factors that can come into play when deciding what light to buy.

Lux and lumens are both related to light brightness but measure it in different ways.  With more and more companies switching to lux, it can be useful to understand the difference.

So which measurement should you be looking out for? In this article, we will dive into what applications need lux or lumens.


This type of light source is a measurement of light intensity that cast onto an object. For example, you may see a lux rating of 800 lux measured at 1 metre on light bulbs. Distance plays a major part in calculating lux, light dispersion causes the light source brightness to degrade over distance.

One lux is equal to one lumen per square metre, the light beam is directly related to how much lux is produced from a light source. As lux measures the intensity of light on an object, this is useful when measuring brightness in specific areas.



This measurement of light so the total light amount emitted in all directions. Lumens relate more to the brightness of the light and does not relate to the intensity of the light when it hits an object. For example, you can have two torches at 2000lm, but one torch could reach 100m whereas the other 500m, lumens only relate to the brightness of the light.

What you should look for


Choosing the right light will be determined on what type of light source you are looking for.

Lux is often widely used in LED products such as spotlights and floodlights, where lumens can provide you with information on brightness such as lightbulbs. Both lux and lumens can be used together, but sometimes only one of the two can give you more information that you will be able to use.

Lux is important to understand as it relates to how bright a particular surface appears to be. It is widely used in Government light standards such as car parks, offices, restaurants, and so.

Lumens, on the other hand, is important for knowing how much brightness a single light emits. This can be useful when comparing the total light bulb brightness to find the best light equivalent when switching to LED. A raw lumen figure can be somewhat misleading as it is a theoretical value. It is calculated by multiplying the maximum output of the light source or single LED’s. More lumens will not help you if the light is not directed in regards to an area.



In conclusion, lumens are used to calculate light brightness whereas lux is used to find light intensity on an object. Lumens are used to find the brightness of your light but it cannot be used to find out the brightness of an area. Lux is, therefore, more useful as it gives you a good idea of how bright the area will be. This is why the Lux measurement is used by Governments to set minimum light standards in places like workplaces and car parks.


At Black Frog Solar, we always recommend asking expert advice before choosing the right lighting for your application.

Plus, if you need any solar lighting solutions, we are your one-stop-shop. Just visit our showroom or call BlackFrog Solar at 07 3881 1990 and schedule a free consultation today.

Until next time, stay tuned to find out more about how solar lights can make a difference for you!

Your friend and solar lighting experts,

The BlackFrog Solar Team