Candelo: Lux & Light Meter

Candelo turns your phone into a beautiful lux meter. Point the top of the screen at the light and read it in lux or foot-candles on a glowing gauge, with min, max and average, a live chart and a plain-words level from "Dim light" to "Direct sunlight". LIGHT METER, FREE • Live lux and foot-candle readings from your phone's ambient light sensor • Min, max and time-weighted average since you last reset, and Hold to freeze a reading • A live chart of the last two minutes • Fast, Normal or Smooth response for steady or flickering light • Record light logs: one sample a second, on any tab, with an optional dim screen for long recordings • Pick a log's light source to see its average PPFD and the light it received, in mol/m² (estimates) • Calibrate against a light meter you trust (a simple multiplier, for the sensor and for the camera) • Typical light levels and tips for a good reading • No light sensor? Measure with the camera instead: lay white paper where you want to measure and fill the frame with it • Beautiful in light and dark mode, with a clean, calm design PLANT LIGHT (PRO) How much light do your plants really get? Candelo estimates PPFD (µmol/m²/s) and the daily light integral (DLI, mol/m²/day) from lux, for the light your plants grow under: sunlight, warm or cool white LEDs, full-spectrum or red-and-blue grow lights, fluorescent, HPS, metal halide or incandescent. • Targets for low, medium and bright-light houseplants, orchids, succulents, herbs, leafy greens, microgreens, seedlings, flowering plants and fruiting vegetables • A clear verdict: a good amount, too little (and roughly how much more light is needed), or more than the plant usually wants • Daylight mode for window light: a midday reading becomes a whole day's estimate • My Plants: save a reading for each plant and see how it compares • Match a PAR (quantum) meter to scale every estimate PHOTO EXPOSURE (PRO) A light meter for film and digital cameras. • Incident metering with the light sensor, or spot metering with the camera: tap what should come out mid-grey • Work out the shutter speed, the aperture or the ISO, in third or whole stops • Exposure value (EV₁₀₀) with a hint of the scene • Exposure compensation, ND filters from ND2 to ND8000, and long exposures timed for Bulb CANDELO PRO • Plant light and photo exposure • Unlimited logs, and CSV export for spreadsheets • The Light widget: take a reading from your home screen • No ads Lifetime is a one-time purchase with no subscription. A monthly plan is there for a single grow season or shoot; it renews until cancelled in Google Play. Not ready to buy? Watch one ad to use Plant and Photo free for 24 hours. PRIVATE BY DESIGN No account and no sign-in. Readings, logs and plants stay on your phone. The camera is asked for only when you choose it, and Candelo reads only the exposure the camera picks: it never records or saves an image. ABOUT THE NUMBERS Phone light sensors are made to set screen brightness, so readings differ from phone to phone; calibrating against a meter you trust brings them closer. PPFD, DLI and exposure figures are worked out from lux, so they are estimates. Candelo is not a certified light meter and should not be relied on for safety, health, workplace or legal lighting requirements. Questions or ideas? Write to apexfordinith@gmail.com.