Passport Meter - For Asensetek Lighting Passport Spectrometers
The original apps are gone, but your Lighting Passport still works. Passport Meter connects to your Asensetek Lighting Passport spectrometer over Bluetooth and shows spectrum, CRI, TM-30, TLCI, lux and much more on your phone.
Do you have an Asensetek Lighting Passport spectrometer that has been lying unused since the Spectrum Genius apps disappeared from Google Play and App Store? Then this app is for you. Passport Meter connects to your instrument over Bluetooth, reads its factory calibration and shows all the important measurements on your phone again: the full spectrum, CRI with R1–R15, TM-30, TLCI, color temperature, lux and much more.
Measure Again
The Apps Are Gone, but the Instrument Still Works
The Asensetek Lighting Passport is a fine handheld spectrometer, but it needs an app. Asensetek's own apps, such as Spectrum Genius Essence and Spectrum Genius Mobile, are no longer available on Google Play and App Store, and the cloud service is gone. That has left many working instruments lying unused in drawers.
A New App for Your Old Instrument
Passport Meter connects to your Lighting Passport over Bluetooth, starts the measurements and shows the results directly on your phone. It reads the instrument's own factory calibration, so the results are specific to your instrument, just as with the original apps.
No Account, No Cloud
There is nothing to sign up for and nothing that can be shut down. The measurements are made and stored on your phone, and you can export them as JSON whenever you want.
Even With a Weak Battery
The Lighting Passport can measure with the charger plugged in, so an old or dead battery does not stop you.
Active Support
Passport Meter is actively developed and supported. You are always welcome to contact us with questions and suggestions.
Works With Your Instrument
Lighting Passport Models
Passport Meter works with the Lighting Passport spectrometers, including Essence, Standard, Pro and Navigator.
For Spectrum Genius Users
Have you used Spectrum Genius Essence (SGE), Spectrum Genius Mobile (SGM), Spectrum Genius Studio (SGS) or Spectrum Genius Agricultural Lighting (SGAL)? Passport Meter works with the same spectrometers and shows your measurements in a modern app. Transmittance measurements, as in SGT, are not yet supported.
Not Affiliated With Asensetek
Asensetek and Lighting Passport are trademarks of their respective owners. Passport Meter is an independent app made by Contechity AB, and is not affiliated with or endorsed by Asensetek.
Key Features
🌈 Full Spectrum
The relative spectrum from 380 to 780 nm with the peak wavelength, calibrated with the instrument's own factory calibration. Tap or drag on the graph to read the intensity at any wavelength.
🎨 Color Rendering: CRI, TM-30, TLCI, CQS and GAI
CRI Ra and Re with all R1–R15 color rendering values shown as bars, TM-30-18 Rf (fidelity) and Rg (gamut), TLCI for film and TV, CQS and GAI.
🌡️ Color Temperature and Chromaticity
Correlated color temperature (CCT) and Duv, CIE 1931 xy and CIE 1976 u′v′ chromaticity, dominant or complementary wavelength and excitation purity.
💡 Illuminance and Photon Flux
Illuminance in lux and foot-candles, the S/P ratio (scotopic/photopic), PPFD (400–700 nm) and photon flux (380–780 nm) in µmol/m²/s, useful also for grow lights.
💾 Save and Export
Save your measurements with a comment, review the results and graphs later, and export a measurement as JSON to use it in other tools.
ℹ️ Explanations Built In
Tap any result to read what it means. The built-in guide explains how to connect, measure and save.
Frequently Asked Questions
How do I get started?
Turn on your Lighting Passport, open the app, tap Find instrument on the Home tab and select your instrument. Bluetooth permission is required. Then tap Measure.
What if the instrument is not found?
Only one app can be connected to the instrument at a time. Close other measurement apps, restart the instrument and search again. Also make sure the instrument is charged, or keep the charger plugged in when measuring.
Does the app use my instrument's calibration?
Yes. Each Lighting Passport is calibrated individually. The app reads that calibration from the instrument when it connects and applies it to every measurement. The calibration is kept on the phone, so later connections are faster.
Where are my measurements stored?
On your phone. Export important measurements before uninstalling the app or changing phones.
I reinstalled the app, how do I get full access again?
Go to the Settings tab, select "Get Full Access," then tap the "Restore Purchase" link.
Need Help or Have Ideas?
We're committed to making this app the best it can be. Your feedback matters to us, and we personally respond to every user who contacts us. Whether you have questions, need support, or have ideas for new features, please reach out to us at [email protected]
Wide Language Support
The app has full support for 40 different languages, making measurement accessible worldwide.
10+ Years of Measuring Light
More than ten years ago we released the world's first smartphone app for measuring the color temperature of light. Since then we have specialized in one thing: turning regular smartphones into accurate light and color meters. With more than one million downloads, our apps are used every day by photographers, growers, lighting designers, teachers and the curious, in more than 150 countries worldwide.
Download the Passport Meter app now
iPhone version
coming soon!
Enjoy full functionality for a day. After that, choose a one-time fee or subscription — a small cost for bringing your spectrometer back to life.