Photone - Grow Light Meter

Take the guesswork out of plant lighting with Photone, the most accurate plant light meter app. Measure PAR, PPFD, DLI, lux, foot-candles, and color temperature (kelvin) directly with your phone or tablet. To measure light with research-grade accuracy, Photone uses the most precise sensor in your device: the camera. Its unique measurement algorithm works directly with the RAW camera sensor data to capture true light intensity. It rivals professional handheld PAR meters, and goes even further by helping you interpret the numbers with in-app guides, tools, and additional features. MEASUREMENTS ⎷ Photosynthetically Active Radiation (PAR) as PPFD in µmol/m²/s ⎷ Daily Light Integral (DLI) in mol/m²/d ⎷ Illuminance in lux or foot-candles ⎷ Light color temperature in kelvin * ⎷ Extended PAR (ePAR) including far-red light (ePPFD, eDLI) * TOOLBOX ⎷ Heatmaps — Create exportable PAR maps, PPFD maps, DLI maps, lux maps, and more ⎷ Logging — Track measurements over time as an interactive chart, Auto-Log sessions, and export them FEATURES ⎷ Industry-leading accuracy, comparable to professional PAR quantum sensors ⎷ Pre-calibrated for your specific device ⎷ Excellent low light sensitivity to detect light pollution for plants ⎷ No ads ⎷ No Bluetooth and location permission required ⎷ In-app guides ⎷ Light source selection for every type of grow light (LED, HPS, CMH, etc.) * ⎷ Average and peak readings * ⎷ Plant light calculator ⎷ Hands-free “read aloud” function * ⎷ Special underwater measurement mode * ⎷ Custom calibration option to align readings to another meter ⎷ Premium support for advanced grow questions * * These features require an in-app purchase to fully unlock DIFFUSER REQUIRED Like every real light meter, Photone requires a diffuser to measure accurately. A diffuser scatters incoming light evenly on the sensor and prevents hotspots. While it may sound complex, the solution is surprisingly easy. You have two options: 1) Easily build a diffuser yourself in less