Turn your device into an accurate light meter — for plants (PAR/PPFD/DLI) & more
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Photone - Grow Light Meter: PAR and lux meter for plants
By Trang Nguyen
Editor, media and streaming
- PPFD readings in µmol/m²/s for plant light
- Daily light integral (DLI) totals in mol/m²/d
- Lux and foot-candle readings for brightness
- Color temperature readings in kelvin
- Extended PAR with far-red light (ePPFD, eDLI)
- Light measurements for houseplants, tents and hydroponics
What the Photone light meter is for
Photone is a light meter for plant growers that runs on a phone or tablet. It is aimed at people who want to check how much usable light their plants actually receive, whether they keep houseplants on a windowsill or run a grow tent, greenhouse, hydroponics system or aquarium.
The usual questions it addresses are practical ones: whether a lamp is hung too high, dimmed too far, or left on for too long. The listing also says it includes guidance for interpreting the readings, not only the raw numbers.
PAR, PPFD and DLI readings for plant light
The core measurement is photosynthetically active radiation, shown as PPFD in µmol/m²/s. This is the light intensity in the wavelengths plants use for photosynthesis.
Daily light integral (DLI) adds that intensity up over a day and reports the total in mol/m²/d. A grower can compare that total against the amount a plant needs, which makes it easier to judge a photoperiod than a single reading taken at one moment.
Lux, foot-candles and color temperature
Photone also reports illuminance in lux or foot-candles. These are the brightness units used in general lighting, so they are useful for comparing a grow light with ordinary room or workspace light.
Correlated color temperature is shown in kelvin. It describes whether a lamp's output looks warm or cool, which matters for growers choosing lamps for different growth stages or for aquarium lighting.
Extended PAR with far-red light
Alongside standard PAR, the app offers an extended PAR reading that includes far-red light. The listing names these as ePPFD and eDLI, the far-red counterparts of PPFD and DLI.
This is for growers who want to account for far-red wavelengths in their light setup, rather than only the standard PAR range.
Using the readings across different grow setups
The same measurements apply across houseplants, grow tents, greenhouses, hydroponics and aquariums. A grower can take readings at the plant position, adjust height or dimming, and check the DLI total against the daily photoperiod.
The guidance the listing describes is meant to help turn these numbers into decisions about lamp placement and timing.
What's new
About this APK
The build we hold is Photone - Grow Light Meter 1.5.1 (APKS split bundle) for Android 10 and up.
- Version
- 1.5.1
- 5594
- Requires Android
- 10+
- Size
- 67 MB
- Package ID
- io.lightray.photone
- Format
- APKS split bundle
- Malware scan
- Google Play Protect
- Permissions
- 12 declared · 1 sensitive
- Camera
- Signed by
- CN=Android, O=Google Inc.
- Certificate SHA-256
- 4f3a4b830ee2f3b8a79622949dbda2c2b159cb27a3c18d926672d1eaab96b88e
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