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Measure light with Lux-o-Meter for Windows Phone


You can now use your Windows Phone device as a lux meter thanks to a new app that has just released called Lux-o-Meter. It measures brightness or illuminance using the built-in light sensor. The sensor is usually next to the front-facing camera on your device. Go ahead and check where it is on your phone.

Head past the break to watch our hands-on video and walkthrough with Lux-o-Meter.

Lux is the unit of measurement displayed by Lux-o-meter. It goes from 1 all the way up to 65,536. A lux meter can be useful in photography and videography as it can help make sure scenes filmed in different light levels have a consistent brightness on screen. It can also be used to check whether a room is bright enough to meet any rules designed to protect workers, for example.


Lux-o-meter is a free download from the Windows Phone Store. It displays ads on top that can be removed by upgrading to the Pro version. The upgrade costs $1.49. What would you use the Lux-o-meter for? Let us know in the comments!

QR: Lux-o-meter



There are 59 comments. Sign in to comment

spyridon says:

That sounds interesting, I am an interior designer and this is going to be a useful tool for my projects

spyridon says:

Tried it, as I said great idea to use the light sensor but it is very inaccurate. On a flat surface between 3cm I get about 500-800 lux difference, maybe its the sensor of the phone. Uninstalled though due to the absurd requirements like phone dialer, media libraries etc.

k0de says:

What device are you on?

k0de says:

Cool gonna trying out the same on my device ill let you now if my findings are similar. I am using a NL 925.

spyridon says:

I hope it is not my phones sensor ;-)

vgian says:

it works fine for me, L620...


wpn00b says:

Awesome thread...thanks hopmedic. :)

hopmedic says:

You're welcome. :-)

spyridon says:

Thats a good start for skeptic people like me :-) I posted a couple of questions for you when you have the time to have a look. Thanks

* skeptic (sorry... Spelling nazi)

John20212 says:

Very informative, thanks for the post; but I would advise the devs to then have 2 versions of the app in the marketplace, one add suported that Data mines the user, and one paid that only has access to the stuff it actually needs.

It does not matter that only the add requires the access, it only means that the adds are data mining you not the actual app, not much of an improvement if you don't want to be data mined.


hopmedic says:

No, you're not being data mined. It only uses the very minimum to provide the ad. And if the ad isn't used, the ad network doesn't even get called.

Interesting. I wouldn't have imagined the light sensor would be sensitive enough for this.

Mario92 says:

Your T-shirt. Want. Now.

Mark Guim says:

Got it from the cool peeps at @nokiaconnects. Hmm, we should ask them for a few of these shirts to give away to WPCentral readers

SamiSaifDine says:

Anyone knows an app to pin the cellular transparently?

vikrant6 says:

Try Quick Settings from colourful studios..

peachy001 says:

I use Connectivity shortcuts, from the store.

bayanii says:

Definitely for indoor photography.

AndreHBuss says:

Is really good :-)

bozvandam says:

8.1 only. Some of us haven't yet you know

ToonU says:

Yea I was heartbroken to see it 8.1 only

marvinpuethe says:

Didn't start on Lumia 920 with 8.1 :(
And I think it needs too much permissions like the photo and music library :o

Zarnywoop says:

same here, won't run lumia920 with 8.1. reinstalled, rebooted. same thing

ariez84 says:

Did anyone caliberate it with an actual hardware lux meter?

Guytronic says:

Good question.

Like to see this compared also.

duncanstives says:

Work for a company that makes display technology. Will check it against a calibrated meter Monday... If its accurate it could be useful.

Is there any reliable app for light meter for photography?

IndrekHaav says:

BTW, the app can go much higher than 65536. My record so far is ~180000 (with an LED flashlight right on top of the sensor).

watom says:

I keep wondering why you're constantly promoting apps that want an endless number of permissions they don't actually need. All they could possibly want with these permissions is our data...

Does anyone at wpcentral care for privacy?

spyridon says:

You are tottaly right, firstly microsoft should be more strict about the apps that are allowed to be in app store, we need quality not quantity, also websites like wpcentral that are trusted by so many people should push developers to be more ethical about WP ecosystem by promoting only ethical developers. We didn't buy android for these reasons.

John20212 says:


WPCentral needs to stop promoting Data Mining apps. Expected better from you guys.


boovish says:

Doesn't work for Lumia 822 with 8.1

ZuNuKoo says:

Works for me. 822 with 8.1

... I'm going to compare it with a real lux meter

Mark Guim says:

Let us know what u find

SAM 77 says:

Works on 820

Very useful is accurate and very responsive.

spyridon says:

How did you test it ? My 820 gave me very widely different readings in a few cm distance the first reading from the rest in various locations, but always in the same angle towards the light source

DarwinPurol says:

Very useful! Light meter cost a lot and this one is free.

rui.silva450 says:

Well I managed to get 4294967 lux out of my side bed light...and I think I'm on planet Earth... :P

psychotron says:

Would have loved to give this a try, but it says "Incompatible with your device". Lumia 1020 running 8.0. :(
Oh, and the permissions thing is kinda crazy. What does a lux meter need access to the music and photo library for??

John20212 says:


I stay as far away as possible from apps that want access to everything, i.e. data mining apps.


Works with

  • Windows Phone 8.1

NutmegState says:

I would not trust this versus a true meter, but it is great to have as a photographer and optics reviewer

CRAP!  Nothing in the article said it was exclusive to Windows 8.1


realwarder says:

I hope its more accurate than all the decibel sound meters. They are all wildly wrong when I compared against a sound meter. Unlike my friends iPhone app which was spot on.

John20212 says:

An iteresting app; but it seems like a data mining App from all the crap it wants access to, so no thanks, until it's updated to use only stuff it actually needs.

  • owner identity
  • music library
  • photos library
  • media playback
  • data services
  • phone dialer
  • movement and directional sensor
  • web browser component
  • internet connection
  • videos library

crea7or says:

LOL. Not available for 925 or in Russia.

can not even install it    nNokia 820 black  8.0 GDDR 3