Light Meter・Lux Meter

Plants, rooms & photo exposure

Free · In-App Purchases · Designed for iPad. Not verified for macOS.

A light meter that shows its method and its stability state, and refuses to save a reading until it has settled. Lux, foot-candles, PPFD and DLI. LUX LIGHT METER — MEASURE LIGHT LEVELS IN LUX Lux Meter turns the rear camera into a reflected-light meter. Point it at a surface and read the level in lux or foot-candles, plus EV at ISO 100 — a desk, a bench, a houseplant in a British winter. WHY YOU CAN TRUST THE FIGURE ▸ The metering method stays on screen: Reflected · Point AE or Reflected · Center. ▸ Readiness comes from a 1.2-second EV window: 6 valid samples over 650 ms within a 0.16 EV spread to lock, then a 0.28 EV hysteresis stops the flicker. ▸ Over 2 seconds without a fresh frame is marked Stale; unusable metadata is marked Error. ▸ Move the target, change zoom or lens, return from the background or recalibrate: the window restarts. ▸ Nothing is saved or sampled until the reading is valid and stable. WORKPLACE AND ROOM LIGHTING SURVEYS Choose the space or task, then run the five-point survey: five samples across the working plane, each held until it settles, giving average, minimum, target range, observed min/average uniformity and the sampling grid. 15 practical targets in 5 groups: general office 300–500 lx, detailed office work 500–750, precision factory 750–1000, warehouse and hospital ward 100–200, corridor 100–150, classroom 300–500, library 500+, operating theatre 1000+, bedroom 50–150, plus kitchen, bathroom, garage, shop floor and restaurant — practical guidance, not legal certification. HOUSEPLANTS, GROW LIGHTS, PPFD AND DLI A plant light meter only helps if it answers for the plant in front of you. Measure at the leaf plane, pick the plant, the light source and the photoperiod, and get a PPFD and DLI estimate in mol/m²/day. 16 plants carry daily targets: pothos and snake plant 2–4, ZZ plant 1–3, peace lily 3–6, monstera and philodendron 4–8, fern 4–7, rubber plant 5–10, fiddle leaf fig 8–12, plus bird of paradise, succulent, herbs, tomato, pepper, lettuce, strawberry. 5 light sources: sunlight, white LED, fluorescent, HPS, metal halide. The sample log marks periods it could not cover, so a low total never reads as a full day. EXPOSURE FOR FILM AND VIDEO The same measurement meters an analogue camera: aperture priority, shutter priority and manual across f/1.0–f/64, 1/8000 s–60 s and ISO 25–12800 in full, ½ or ⅓ stops. Each solution shows the exact result, the nearest setting your kit offers and the residual error in stops — outside the range, by how many. Manual shows Over / Matched / Under on a ±3-stop scale, and Cine turns FPS, shutter angle, ISO/EI and ND into an equivalent shutter and f-number. HISTORY AND CSV EXPORT Readings, surveys, DLI estimates, comparisons and monitoring share one history list — every entry keeps its method, readiness state, calibration and mode inputs. Page the archive, export to CSV. ALSO INCLUDED ▸ Reference tables — 16 lux environments, a 0.1 lx full moon to 130,000 lx direct sun; 11 EV scenes, −6 EV starlight to +18 EV snow ▸ A/B comparison — take A, walk to B, read the EV difference and brightness ratio ▸ Continuous monitoring — trend with min / avg / max, true sampling interval, samples and misses, markers; background time logs as a gap ▸ Guided calibration — type in a known value, hold on a uniform surface, wait for stable, apply the offset ▸ Hold a reading on screen; flip lux ↔ foot-candles with one tap HONEST LIMITS AND PRIVACY A reflected-light estimate from camera exposure metadata — not an incident meter, not a PAR sensor, not a certified laboratory instrument — so it depends on the surface you aim at. The camera only measures light: no photo is taken or kept, nothing is uploaded, no account, and readings leave only in a CSV you export. The free meter covers the live reading and readiness state; Pro removes ads and unlocks everything. Point, wait for stable, read the figure — and stop guessing what a room or a leaf is really getting. Terms of Use: https://zeroplay.io/docs/legal/terms-of-service Privacy Policy: https://zeroplay.io/docs/legal/privacy-policy

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Bug fixes and performance improvements for a smoother experience.

Version 1.4

The developer, ZeroPlay Ltd., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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Information

Provider
  • ZeroPlay Ltd.
Size
  • 118.2 MB
Category
  • Utilities
Compatibility
Requires iOS 15.1 or later.
  • iPhone
    Requires iOS 15.1 or later.
  • iPad
    Requires iPadOS 15.1 or later.
  • iPod touch
    Requires iOS 15.1 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and 32 more
  • English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
Age Rating
4+
In-App Purchases
Yes
Copyright
  • © ZeroPlay Ltd.
  • Developer Website
  • Privacy Policy

    • More by ZeroPlay Ltd.

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