Photone - Grow Light Meter

In-app purchases
4.8
5.64K reviews
100K+
Downloads
Content rating
Everyone
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About this app

Take the guesswork out of grow lighting! Measure PAR / PPFD, Lux, fc, and Kelvin: All within the most accurate light meter app out there.

Setting up your plants' optimal lighting is not easy — if not impossible without a proper PAR / PPFD plant light meter. Calculating your indoor garden's daily light integral (DLI) to match your plants’ needs allows you to optimize your lighting for maximal yield at minimal electricity consumption.

Our Photone grow light meter app measures photosynthetically active radiation (PAR) as PPFD in µmol/m²/s, calculates the daily light integral (DLI) in mol/m²/d, and measures illuminance in foot candles or Lux. It also allows you to measure light temperature in Kelvin which can help you determine if a light is suitable for fruiting and flowering or for vegetative growth.

It is by far the most accurate light meter app for plants and achieves industrial grade accuracy that easily compares to dedicated and expensive quantum PAR meters for many hundreds of dollars. You can learn more on how we achieve over 95% of accuracy against research grade laboratory equipment and how to achieve maximum accuracy by yourself in our white paper: https://growlightmeter.com/whitepaper/

The app also contains useful guiding articles to help you get the most out of your plant lighting. In addition, you can find more informative and educational content on our blog: https://growlightmeter.com/blog/

Wondering how much light your plants need? The plant lighting calculator on our website helps you to dial in your lighting to your specific plants' needs: https://growlightmeter.com/calculator/

To receive an accurate PAR and thus DLI measurement, you need to select the correct light source that you are measuring.
Updated on
Oct 17, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
App activity, App info and performance, and Device or other IDs
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.8
5.56K reviews
Shawn C
May 8, 2024
I'm on a Google Pixel 6 and every time I try to use this meter it jumps all over the place. It'll start low, go up and max out and then come back down repeatedly. Is there a solution for this? Update: if you're having issues, go into settings and turn off diffuser detection. That fixed it for me.
1 person found this review helpful
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Lightray Innovation GmbH
May 7, 2024
Hi Shawn, Thx for the bug report. This should not be the case but it could be an issue with your specific device. Can you please reach out to us by hitting the feedback button in the app. This will allow us to analyze this specific issue closer. Best regards, Dennis – Photone Developer
Bryan Mayland
April 28, 2023
Look, this app is incredible. For years I used a dedicated lux meter and did all the math myself to convert to PPFD/DLI. Now, I can't even think of a feature I'd want that this app doesn't have. PPFD, DLI, color temp, lux, measurement hold, tilt detector, peak / average values, quick changes for DLI hours, oh and the values are correct too. Never before have I been so pleased with a piece of software! I'd pay for this app for sure, so long as it was a one time cost and not a subscription.
70 people found this review helpful
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Lightray Innovation GmbH
May 6, 2023
Hi Bryan, Thank you very much for your insightful review! We're happy to hear that our app is of such help to you! :) Best, Dominik and the Photone Team
Samantha
April 14, 2023
Great concept, quick response from support. I had an issue with a tip not dismissing and they got back to me the next day from the other side of the planet. The light readings are pretty far out from my actual meter, but hopefully they can fine tune it for better accuracy. Be sure to look through the extras on the site, they have a great little start of a plant database with light info for various species - looking forward to this being integrated fully into the app in time. Well done, devs!
20 people found this review helpful
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Lightray Innovation GmbH
April 15, 2023
Hi Samantha, Thank you very much for your insightful review! We're happy to hear that you like our app :) If you have an actual meter and want both devices to read the same you can simply calibrate according to that. We have a guide showing how here: https://growlightmeter.com/guides/how-to-calibrate-photone/ Best, Dominik and the Photone Team

What's new

We added many small improvements and made Photone more performant.