December 2, 2015

Turn Your iPhone Into a Fully Featured Light & Color Meter with Lumu Power

Lumu Power iPhone Light and Color Meter
There are several great iPhone apps and attachments that turn the device into a light meter, including a previous entry from Lumu. But the company's latest product takes metering to the next level by adding color to the equation.

Announced on Kickstarter earlier this week (and already having surpassed its funding goal several times over), the new Lumu Power is an attachment for your iPhone that turns the device into a fully functioning light and color meter. Unlike the original Lumu, which only had one sensor for measuring luminance values, the new Lumu Power has two sensors, one for luminance and one for accurate color temperature calculations.

Here's their Kickstarter video:

And here's a quick making-of video that details the process behind making the Lumu Power's new color sensor as accurate as it can be.

Here are the Lumu Power's tech specs:

Lumu Power iPhone Light and Color Meter

Exposure

  • Measuring range: EV -4 to 20 at ISO 100
  • Accuracy: +/- 0.1 EV 
  • Light receptor: fast-response Silicon photo diode, CIE spectral luminous efficiency
  • Hemispherical Diffuser, Cardioid-type responses

Color (Temperature)

  • Light receptor: True Color Sensor, CIE 1931 Color standard Human eye perception
  • Sensitivity: Visible light
  • Dynamic range: 1:1,000,000
  • Accuracy: < 0.6 deltaE, Repeatability: < 0.2 deltaE
  • Flat Diffuser, Cosine-type response

Illuminance 

  • Measuring range: 0.15 - 250,000 lux
  • Accuracy: +/- 3%
  • Flat Diffuser, Cosine-type response

Other

  • Power source: iOS device 
  • Materials: Housing: Stainless Steel, Diffusers: Polycarbonate Lexan
  • Compatibility: iOS devices using Lightning connector, running iOS 8+

Hopefully the Lumu Power will eventually be compatible with Adam Wilt's impeccable Cine Meter II app, which already has various color metering functionality built into it. The original Lumu works brilliantly with Cine Meter II, so hopefully getting the new version to work will come sooner rather than later. 

Currently, you can get a Lumu Power through the Kickstarter campaign for an even $200. It's certainly not inexpensive, but compared to the cost of purchasing a separate light and color meter (probably a $2000 investment), the Lumu Power is a steal.     

Your Comment

14 Comments

This is excellent! I mainly use Blackmagic cameras, and my biggest headache is always guessing the right color temp. I've gotten good at it, but it'll be nice to have something concrete that's so affordable!

December 2, 2015 at 3:26PM, Edited December 2, 3:26PM

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Michael Schmucker
Producer, Cinematographer, Animator
138

Cine Meter II along with the $30 Luxi for all does all this for $55 complete.

I'd be curious to see the difference in measurement once this product ships, but I don't see it being worth an extra $150.

December 2, 2015 at 4:23PM

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seanmclennan
Story Teller
956

Sean, how do you like that combo?

December 3, 2015 at 12:15AM

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Nick
Director/Editor/Compositer
342

Yeah it seems like the Cine Meter II is raved about even IN this review of the Lumu, so, is this Lumu way better??

December 3, 2015 at 7:02PM

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Another thing to consider is that this attachment might not work for future iphones, while if you buy a light meter it works forever.

December 2, 2015 at 4:47PM, Edited December 2, 4:47PM

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Almosh Taltosh
DP/Director
136

My phone is the first thing to run out of juice -- way before the camera, lights, or sound. Makes me weary of any gear that attaches to the phone.

December 2, 2015 at 8:42PM, Edited December 2, 8:42PM

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Alex Zakrividoroga
Director
4013

Make it under 100 dollars.

December 2, 2015 at 8:58PM, Edited December 2, 8:58PM

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Jonathon Sendall
Stories
1839

Hmm, definitely seems a bit overpriced. This is more expensive than the original one right?

December 3, 2015 at 12:13AM

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Nick
Director/Editor/Compositer
342

Show me a color temperature meter for a price close to this. Impossible. Cheapest I've found are $800.

December 3, 2015 at 3:44AM, Edited December 3, 3:44AM

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Gilles van Leeuwen
Filmmaker
370

I'm getting good at these No Film School articles.
Before I even click them I can just say "Kickstarter" outloud.
Yay I win a point.

It's like a mini game now.

December 3, 2015 at 12:44AM, Edited December 3, 12:44AM

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Film GRIT
Host With The Most
368

Anyone know if it supports LED lights for color temp?

December 3, 2015 at 1:01AM

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Gregory Greenhaw
DPO/Colorist
99

Light is light my friend, whether it be tungsten, florescent, led etc. Probably doesn't work with flash but that's another topic for a photography forum.

December 3, 2015 at 4:15PM

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All light is not created equal, LED light has gaps in the spectrum that are missing, thus the new CRI rating system, with Tungsten Halogen Natural light and so on the color spectrum is 100% reproduced, LED is artificial light missing rays and parts of that spectrum so some meters won't give accurate readings for LEDs.

EDIT: I asked this question directly to them and they confirmed it will work with LED lighting.

December 7, 2015 at 2:02PM, Edited December 7, 2:31PM

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Chase Axton
Cinematographer
1173

So is this a step up from Cine Meter II then? That's only like $30 right?...and it's amazing? Why are we even talking about this one? Is it totally better?

December 3, 2015 at 6:58PM

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