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:
https://www.kickstarter.com/projects/lumulabs/lumu-power-a-light-meter-for-the-future
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:
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.
Source: Lumu Power -- Kickstarter
