Transform your smartphone camera into a professional light meter

The Diffuser & Cosine Corrector accessory enables your smartphone to measure light at top-level accuracy without any compromises. This ingeniously designed accessory is easy to use and attaches seamlessly to every smartphone or tablet. Designed to be used in conjunction with the Photone light meter app.

Best-in-class measurement accuracy
Every Diffuser & Cosine Corrector accessory made has the exact same optical transmission allowing the measurement algorithm of Photone to adjust exactly to it. This results in the best possible accuracy and highest reproducibility of your measurements.

✅ Excellent cosine correction
The accessory's sophisticated design provides your smartphone light meter with an ideal directional response. This leads to accurate measurement results in real-world scenarios where light strikes from all angles.

✅ Durable and easy to use
Simply attach and start measuring: it couldn't be easier to use. Made out of strong materials and shipped with a light-proof bag, it is built to last.

✅ Premium quality
The Diffuser & Cosine Corrector accessory was developed and tested in a Swiss optics laboratory. Every piece shipped is hand-assembled and has passed strict quality control.

PHOTONE LIGHT METER APP

Photone is a light meter app that measures light parameters for plants and grow lights. It uses your smartphone's camera to measure:

Photosynthetically active radiation (PAR): In micro-mol/m²/s
Daily light integral (DLI): In mol/m²/d
Illuminance: In foot-candles or Lux
Light temperature: In Kelvin

Features:

Uses your smartphone's camera
Designed for grow lights
Has low average error rates
Available for Android and iOS.

Compared to various common hardware light meters or similar apps, Photone is repeatedly achieving the lowest average error rates in measuring grow light illuminance.

Built for Grow Lights - actively developed, tested, and optimized for the widely used grow lights in the market.
Minimal Equipment - Photone requires your smartphone's camera and a diffuser to get accurate measurements.
Tailored to Plants - Measure PAR in µmol/m²/s and even calculate your plant's DLI at the palm of your hand.

WHAT YOU NEED

Smartphone or tablet: The Photone app uses your device's camera to measure light.

Diffuser: A diffuser ensures that the camera sensor is exposed to an even amount of light, which is necessary for accurate measurements.

Light source selection: You need to select the type of light you're measuring so that the app can correct for spectral mismatch errors.

Why you need these things

Diffuser - Without a diffuser, you can only compare readings relatively, not get accurate absolute measurements.

Light source selection - Selecting the correct light source setting is crucial for accurate measurements

DIRECTIONS

Taking a measurement is simple: First, select a measurement value by swiping left or right on the main screen. Then, place your device on top of your plants' canopy. If you're unable to read the measurement (e.g. because your light is too bright), press the lower part of the screen to HOLD the measurement.

1. Select a measurement value

2. Place your device on top of your plants' canopy

3. If you can't read the measurement, press the lower part of the screen to HOLD the measurement

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