PHENOTRACK

A PPFD meter that was already in your pocket.

LuxMeter reads your phone's light sensor and converts lux to PPFD for the exact grow light you run. Then it works out your daily light integral and keeps a history of every reading.

Coming to Android · Google Play Open the web planner

Free. No account needed to measure.

360+grow-light spectra in the catalogue
µmol/m²·sPPFD, not just lux
mol/m²/dDLI for your photoperiod
11languages, Danish to Japanese

Three tools in the box, built for the tent, the greenhouse and the windowsill.

Meter

Live PPFD at canopy height

Pick your fixture and hold the phone where the leaves are. The dial shows whether you are under, in or over the target for the crop stage.

DLI

Daily light integral

Turn a PPFD reading and a photoperiod into moles per day, so 18/6 and 12/12 can be compared fairly.

Setups

Your lights, your heights

Save each tent with its fixtures and lamp distance. Drag the lamp to see the estimated PPFD change before you move the real one.

Everything in the box

Measure

  • Single Point

    Hold the phone at the canopy and read PPFD and lux, with the zone for your stage.

    Android only

  • Grid Map

    Walk the canopy cell by cell into a heat map, with auto-capture, placement advice and a shareable image.

    Android only

  • Live

    Follow the reading as you move, bookmark moments and save the session's average.

    Android only

  • Sound feedback

    A tone that rises with the light, the value spoken aloud, and a beep or vibration once the reading is stable.

    Android only

  • Three meter faces

    A bar, a ring or the two-needle dial.

    Android only

  • Measure without a setup

    Pick a lamp from the catalogue and measure straight away.

    Android only

Understand

  • Spectrum summary

    Each setup's blended spectrum: blue, green, red and far-red shares, CCT, lux per PPFD and light advice.

  • DLI calculator

    DLI over your photoperiod, and Reach your target: the dimmer setting or lamp height that gets you there.

  • History

    A curve for each day, DLI bars for the last 14 days, and grid maps compared before and after.

Trust the number

  • Calibration

    Calibrate the sensor against one reference value or side by side with a PAR meter.

    Android only

  • 360+ grow-light spectra

    From HPS and CMH to white and blurple LED, each with its own lux/PPFD factor.

Share and keep

  • CSV and PDF reports

    Export readings as CSV, and PDF reports of your PPFD history, a grid map or a before-and-after comparison.

Everyday

  • Home-screen widgets

    The latest PPFD, its status and today's DLI, in a large and a small widget.

    Android only

  • Start guide and welcome back

    A short guide the first time, and your latest reading and DLI when you come back.

  • Lux or foot-candles

    Every lux figure follows the unit you choose.

  • 11 languages

    Switch the language in Settings at any time.

  • Light and dark theme

    Follow the phone's setting or pick one yourself.

  • No account needed

    Everything works without one. An optional account syncs your setups and readings between Android and web.

  • Encrypted on the phone

    Your setups and readings are kept in an encrypted database on the phone.

    Android only

Android

The full meter. Uses the ambient-light sensor on your phone, with optional calibration against a reference meter.

Web

No sensor in a browser, so the web version is for planning: the DLI calculator, your Setups, the catalogue and your synced history.