Luxi is a Clip-On Adapter That Transforms Your iPhone Into a Proper Light Meter


Back in March 2011, we featured an iPhone app that lets you use your iPhone as a makeshift light meter. The app apparently works pretty well, but if you’ve been looking for a fancier solution involving your iPhone, one has finally arrived.

It’s called the Luxi, and is a small clip on accessory that turns your iPhone into a proper light meter.

As with standard handheld light meters you can find on the market, the Luxi comes with a round white diffusion dome. Well, that’s pretty much all the adapter is: a clip and a dome.


The dome is designed to rest securely over your iPhone’s front-facing camera. Once it’s in place, you boot up the free app that is offered with the device (or an existing light meter app you’re already using) and you’re good to go.


Extrasensory Devices, the company behind the Luxi, claims that the diffusion dome will lead to more accurate readings than if you use the front-facing camera by itself. It also reportedly delivers “comparable results” when pitted head-to-head with professional meters:

High-end professional light meters can cost upwards of hundreds of dollars, and until recently didn’t come with a nice touchscreen-based interface. Luxi essentially puts an incident light meter in your hand for just $20.

Luxi is patent pending and will retail for $25 when it’s launched. You can support the product and pre-order a unit for yourself over on Kickstarter for a contribution of $14.

Luxi: Incident light meter adapter for iPhone [Extrasensory Devices via Cult of Mac]

  • Puke

    I always wondered why it took so long for this to happen, especially with the price of a quality light meter

  • Herby

    Wow very cool

  • Jeff Bridges

    I had this very idea a few years back.
    And once the new sekonic light meters came out I knew it would happen soon.

  • Jim Felt

    I’ve missed using great Incident Meters since Digital Capture allowed and even encouraged mere Chimping! This is so great! I certainly K-S’ed mine.

  • Norshan Nusi

    This is great!

  • David Liang

    Dammit man! If this thing came out last year I wouldn’t have sold my 4….

  • foggyflute

    I will love to have a look at comparison chart that backing the claim
    that this thing more accurate and useful than the in-camera one that being show as inferior on that video. I know they need to advertising, but stimulate the result that much for the sake of sale is disgusting.

  • Gordo

    Seems like it would work as a colorimeter / wb meter as well

  • JWalker

    This can’t detect flash EV.. rather toyish

  • Mansgame

    does it have a sync port? Can it work with flash? *edit* I’m being rhetorical… This is pretty much a toy without those.

  • walless

    Yes, they’ve failed to properly substantiate their claims, just as you have failed to be grammatically correct.

  • foggyflute

    Yes, I will really love to hear your correction on my grammar errors, I’m not a native English speaker so i always love to get better at it by having some help :)

  • Compress Group

    Without flash EV or a sync port it’s pretty basic, but I applaud them for getting it out there! Maybe this will give Sekonic the kick in the pants they need.

  • Richard709

    Don’t mind him, he’s just a mad little boy.

  • uy

    cool gadget but the photo above (side by side with the Nikon) foils it.

    First, the camera is is ‘M’-Manual mode where aperture AND shutter speed is selected by user.

    Second, the EV scale right underneath the aperture reading on the camera clearly shows that at this setting, its >2 stops underexposed.

    Think twice before you take $20 out of your pockets eh?

  • Jim

    The iphone (mine is a 4) seems to conk out at about EV 4, while my Sekonic L-558 will meter down to EV -2 (incident). That’s 6 stops lower. Of course, smartphone sensitivity will likely increase with new generations of phones, but the Sekonic’s sensitivity, spot meter and flash metering abilities will handle just about anything. This will be a handy tool (I use and like the pocket light meter app a lot) but it will only be “comparable” to professional light meters within the narrow scope of its abilities.

  • Stephen Sidlo

    I love this idea but the way smartphones have advanced inside two years, I can see it being included within one. Nice idea though.

  • Joakim

    Sorry can’t see anything wrong with that, ofc the EV in the camera may be off when using a light meter.

  • Mansgame

    they already do have apps that come pretty close using the phone’s camera.

  • chi_able_guy

    Don’t know if anyone else asked this, does it work with strobe?

  • Vlad Dusil

    …but… will it blend?

  • Victor Quezada Carrasco

    Come on people!! The world is not black and white only!! Not everyone uses flash sync, hell, the lightmeter i’ts not designed only for stills studio work!! I’m a cinematographer and will alway trust more on the readings a meter will give me over the camera one, ‘cos I can use the zone system and all of that, but come on! whats the deal with the though of “it’s only a real tool if it has EVERYTHING and it is REALLY EXPENSIVE”?? I actually see this as a pretty functional tool. Although I wouldn’t use it ‘cos i only use the Spot Meter of my Sekonic for my documentary work. XD

  • boggy4062

    Not every dedicated flash meter supports this functionality either. I believe that this could be accomplished with the software as well.