LuxFox: Light & Lux Meter

LuxFox is an accurate, intuitive light meter and illuminance analyzer that uses your smartphone's built-in ambient light sensor (or smart camera fallback) to measure brightness in real time. Whether you are optimizing office lighting, caring for indoor houseplants with proper PPFD and DLI, setting up photography studio exposure, or inspecting lighting compliance at home, LuxFox gives you instant, reliable readings. REAL-TIME LIGHT MEASUREMENT • Precision Illuminance Meter: Logarithmic 1 to 100,000 lux arc gauge with crystal-clear numeric display. • Dual Units: Instant toggle between Lux (lx) and Foot-Candles (fc) with automatic standard conversion (1 fc ≈ 10.764 lux). • Live Statistics: Monitor real-time MIN, AVG, and MAX brightness values throughout your measuring session. • Hold & Reset: Freeze readings with one tap to inspect hard-to-reach light sources, or reset metrics instantly. • Screen Keep-Awake: Keep your display illuminated while taking steady measurements. 13 RECOMMENDED LIGHT PRESETS • Compare current illuminance against international lighting standards: - Living Spaces: Bedroom (100 lx), Living room (150 lx), Kitchen (300 lx), Hallway (100 lx). - Work & Study: Computer desk (300 lx), Office work (500 lx), Precision drawing & crafting (1,000 lx). - Plants & Nature: Low light / shade plants (1,000 lx), Medium light plants (3,000 lx), Direct sun plants (10,000 lx). - Photography & Outdoors: Overcast outdoor (2,000 lx), Full daylight shade (10,000 lx), Direct bright sunlight (50,000 lx). • Clear color-coded badges indicate if ambient illumination is Too Low, Optimal, or Bright. SPECIALIZED TOOLS (PLANT & PHOTO) • Plant Grow Light Mode (PPFD & DLI): - Calculates photosynthetic photon flux density (PPFD in µmol/m²/s) from lux. - Computes Daily Light Integral (DLI in mol/m²/day) based on photoperiod hours. - Tailored light spectrum presets: Sunlight, White LED, Warm LED, and Fluorescent. • Photo Exposure Meter: - Calculates Exposure Value (EV 100) instantly from ambient brightness. - Helps configure manual camera settings: Aperture (f-stop), Shutter Speed, and ISO. TWO-POINT CALIBRATION & HARDWARE FALLBACK • Match-a-Reference Calibration: Calibrate slope factor and offset against a certified lux meter. • Camera Fallback: If your phone lacks a hardware light sensor, LuxFox uses Camera2 auto-exposure metadata to estimate lux in memory without saving any pictures. HISTORY & CSV EXPORT • Save measurement records with timestamp, lux, min/avg/max, and source. • View historical reading trends with interactive charts. • Export history to standard CSV files compatible with Excel and Google Sheets. 100% PRIVATE & OFFLINE • Complete Privacy: All calculations happen locally in memory. Zero camera photos are stored or sent anywhere. • Fully Offline: No login, no account, no cloud servers required. LuxFox is completely free to use. An optional one-time Pro purchase removes all ads and unlocks unlimited history and Pro tools permanently.