We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is a Lux Meter?

John Lister
By
Updated May 16, 2024
Our promise to you
EasyTechJunkie is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At EasyTechJunkie, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

A lux meter is a device for measuring brightness, specifically, the intensity with which the brightness appears to the human eye. This is different than measurements of the actual light energy produced by or reflected from an object or light source. The lux is a unit of measurement of brightness, or more accurately, illuminance. It ultimately derives from the candela, the standard unit of measurement for the power of light. A candela is a fixed amount, roughly equivalent to the brightness of one candle.

While the candela is a unit of energy, it has an equivalent unit known as the lumen, which measures the same light in terms of its perception by the human eye. One lumen is equivalent to the light produced in one direction from a light source rated at one candela. The lux takes into account the surface area over which this light is spread, which affects how bright it appears. One lux equals one lumen of light spread across a surface one square meter.

A lux meter works by using a photo cell to capture light. The meter then converts this light to an electrical current, and measuring this current allows the device to calculate the lux value of the light it captured.

The most common use of this type of meter is in photography and video filming. By measuring the light in luxes, photographers can adjust their shutter speed and depth of field to get the best picture quality. The device can also be very useful for filming outdoor scenes of television programs or movies as it allows adjustments to make sure scenes filmed in different light levels have a consistent brightness on screen.

To a very limited extent, it is possible to use a camera as a makeshift lux meter. This works because some cameras measure light and automatically adjust the exposure time appropriately. Using a formula, a photographer can then reverse the calculation and convert the stated exposure time into light levels. This method has several limitations, including the fact that some light is absorbed as it passes through the camera lens, so the calculation must be adjusted accordingly. The method can be useful in situations where a separate meter is impractical, however, such as with delicate objects in a museum that can’t easily be reached without disruption.

Another common use of a lux meter is in meeting health and safety regulations. It can be used to check whether a room is bright enough to meet any rules designed to protect workers from suffering damage to their eyesight, for example. The meter takes into account the size of the room in a way that simply measuring the intensity of the light source in lumens would not.

EasyTechJunkie is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
John Lister
By John Lister
John Lister, an experienced freelance writer, excels in crafting compelling copy, web content, articles, and more. With a relevant degree, John brings a keen eye for detail, a strong understanding of content strategy, and an ability to adapt to different writing styles and formats to ensure that his work meets the highest standards.
Discussion Comments
By anon193559 — On Jul 05, 2011

Definitions are bad. I am a professor and researcher in photometry and suggest you follow ISO 80000:7. You will discover your mistakes. -- Prof. Marin

By anon162693 — On Mar 24, 2011

There is no difference. It's the same. You must know that Europe and US units are different so you have devices which measure units in lumens or in footcandle. These devices measure light as our eye does.

You can buy devices that measure illumination and

on foot candle is 10.763910417 Lux. Footcandle is US;

Lux is Europe. Same stuff. They just make things complicated. That's how they protect their market. Neko, architect

By DentalFloss — On Dec 19, 2010

I have a photographer friend who once tried to show me how to use a lux meter, and I found it more scientific and confusing than I would have expected. I think any art form, including photography, has technicalities that might not interest some people, or that may at least seem difficult, though most people who take pictures never have to think about things like exposure and light, lux meters, and other more scientific aspects of taking a picture.

By Denha — On Dec 18, 2010

@anon106114, they are essentially the same thing, although whether they are called a light meter or a lux meter depends on what field uses them; some fields, such as theater and cinematography for example, need to use lux meters to determine brightness for scenes, but probably are not familiar enough with lux units to call them that, and call them light meters instead.

By anon106114 — On Aug 24, 2010

What is the difference between a lux meter and a light meter?

John Lister
John Lister
John Lister, an experienced freelance writer, excels in crafting compelling copy, web content, articles, and more. With...
Learn more
EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.

EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.