Photone - Grow Light Meter has 590 thousand installs. Users love it: 4.6 stars from 10,817 ratings.
Photone - Grow Light Meter is made and published by
Lightray Innovation GmbH.
AppBrain is an independent app data site and isn't affiliated with Lightray Innovation GmbH.
The app name, icon, screenshots and description belong to Lightray Innovation GmbH and are shown as
published on Google Play.
About Photone - Grow Light Meter
“Turn your device into an accurate light meter — for plants (PAR/PPFD/DLI) & more”
Photone - Grow Light Meter is a tools app developed by Lightray Innovation GmbH.
Install Statistics
Photone - Grow Light Meter has been installed 590 thousand times. In the last 30 days, the app was installed 14 thousand times. It is ranked #142 in tools.
User Ratings
Photone - Grow Light Meter is rated 4.56 out of 5 stars. The rating is based on 11 thousand ratings.
App Information
Photone - Grow Light Meter is freely available from Google Play. The app size is 87.17 MB. The latest version available is 1.5.4. The last update was on September 10, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play since July 2021.
Description by Lightray Innovation GmbH(from Google Play)
Take the guesswork out of plant lighting with Photone, the most accurate plant light meter app.
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Comments on Photone - Grow Light Meter for Android
★★★★★Jeremy Haynes· Dec 2, 2025
Tested against an actual meter. Compared to other apps, this is hands down the most accurate to do PPFD measurements. At most depending on one the settings you have there could be roughly 5% difference. So that said, if you can not get the Diffuser accessory or get your hands on Diffuser Paper (matte on one side and glossy on the other) then you will most likely be reading slightly out. Calibrate the app to your phone and set to your type of light for the Best Reading.
★★★★★Tristan Knight· Sep 4, 2026
I love this app, and I always recommend its use with other indoor hobby horticulturalists. For a fraction of the price which one might pay for a professional PPFD meter you can very effectively dial in your light intensity, smooth out canopy hot spots and check DLI all with a suitable smart device. Well done Photon
★★★★★Ryan LaHaie· Jan 16, 2026
⭐️⭐️⭐️⭐️⭐️ "The Best Investment for My Growth Professional Accuracy Without the $500 Price Tag! "I’ve been using the Photon app for a while with the 'paper diffuser' method, but I finally upgraded to the official Diffuser & Cosine Corrector accessory and the difference is night and day.
★☆☆☆☆Silent Camper· Jul 14, 2026
All features now require payment, I've had this app since the start and even got a new phone to use it on. Now they paywall all the LED features like they did on IPhone. At this point may as well use an old phone and sideload and older version. Edit to reply to photon: Pay for something that was already free before? Hell no, I would rather go buy a real PPD meter at that point. I used to recommend many people get this app but not something I will do anymore. it's always a bait n switch.
★☆☆☆☆Elaine Thompson· Jun 24, 2026
The app says it's not calibrated for my S26 and may be inaccurate. The solution: calibrate with a photometer I trust. If I had a photometer I trusted, why would I be using my phone? It also falsely detects a diffuser, even though the app says not to use one. I'm hoping they get the S26 resolved but until then I'm uninstalling. It's impossible to know what I'm actually measuring.
★☆☆☆☆Omar Robles· Aug 6, 2026
It only lets you check natural light and incandescent bulbs when 99 percent of homes have LED lights. This app sucks.
Google Play Rankings for Photone - Grow Light Meter
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