Arri's Free Photometrics App Might Be Your New On-Set Lighting Dictionary

ArriLighting, whether we like it or not, is a highly technical craft. Even though it isn't necessary to know the amount of footcandles or lux that a light gives off at a certain distance, or how a light's CRI will affect the final image, in order to light a shot effectively, you can bet that the most discerning cinematographers and their gaffers are absolutely thinking about those technical characteristics when they light. Even though that type of information can be intimidating for beginning (and even intermediate) filmmakers, Arri's new Photometrics app puts all of it right at your fingertips:

Here's some of the key information that the Photometrics App crams into your pocket:

  • Luminous Output
  • Beam Diameter
  • Beam Angle
  • Flood, Middle and Spot Photometrics
  • Luminous Distribution Graph
  • Camera Exposure and Aperture Information
  • Light Properties including: Color Temperature, CRI, Protection Rating, Dimming, Dimensions, Weight, Power Draw, Lamp Holder Type, Mounting, Reflector Type, Lens Type, and Scrim Size
  • Metric and Imperial Units
  • Bulb Selection

Here's what the app looks like:

Arri Photometrics App

Screen Shot 2013-11-29 at 2.09.26 PM

While this app certainly has some really useful information packed into it, it's important to remember that it's only applicable to Arri lighting fixtures. (It is an Arri app, after all.) This is both a good thing and a bad thing. It's good because almost every set that I've ever been on has had at least a few Arri fresnels, or maybe an Arri HMI or two. Arri lamp heads are some of the most ubiquitous pieces of gear around, so this app ought to come in handy. However, for extremely low-budget sets where the lighting is pieced-together, this app likely won't be practical at all.

Unfortunately this app is currently only available on iOS7, so it won't work on iPhones or iPads without the latest version of the OS. Sadly, it's also unavailable on the Android platform. You can download the Arri Photometrics app through the App Store, or click here to find it through iTunes:

What do you guys think of the Arri Photometric App? Can you see yourselves using it on future productions? Let us know in the comments!

Link: Photometrics -- iTunes

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Your Comment


Seems like a great app to install and never, ever open again.

November 29, 2013 at 4:56PM, Edited September 4, 8:21AM


Start using Foot Candles, or Lux in this case, like a real DP and maybe you'll open it more then... #DSLRSruineverything

November 30, 2013 at 12:21AM, Edited September 4, 8:21AM


"like a real DP" made me laugh

November 30, 2013 at 4:55PM, Edited September 4, 8:21AM

Brooks Reynolds

Not just that, What about the hashtag? DSLRruineeverything. It's almost 2014. Not 1998 anymore.
You're funny!

December 5, 2013 at 11:11PM, Edited September 4, 8:21AM


If you place your lights 10M from the subject, you'll need a lot of firepower -- yes, I know, it's just an app sample - which is hard on the pocket of the low-budget shoots. I reckon most low budgets might have a sub-1K Fresnel as the key and a handful of LED panels as fill/hair/background lights grouped tightly around the set. Also, I doubt these work with flags and cookies, aside of the spot metering.

November 29, 2013 at 5:28PM, Edited September 4, 8:21AM


That example shows a 160W LED fresnel that costs around 2500 Euros (probably the same in Dollars). You can rent something like that for 30-50 bucks per day and plug it into every household socket or even small camping generators.
So this example is not really high-budget.
A 12kW ArriSun that needs to be carried by four people, set up with a small crane and powered by a huge truck, that would be high budget!

December 5, 2013 at 2:28PM, Edited September 4, 8:21AM


I think what he means is a professional DP as opposed to self-trained people who do no-budget projects, part time for the love of it.
Personally I've never been on a professional production that didnt have at least a few ARRI HMI's. I've just started using this app but it looks like i'll be using every day from now on.

Outside of the industry, 'DP' has kind of become a byword for cameraman / camera operator / videographer as opposed to what it 'really' i.e the head of the camera and lighting dept, a very senior position.

I've seen many DPs getting quite annoyed at this.Personally i've met people with less experience than my trainee camera calling themselves 'DP's. I just think it's funny

January 7, 2014 at 12:19PM, Edited September 4, 8:45AM