# Light Meter・Lux Meter — Plants, rooms & photo exposure

> Professional light meter app for accurate lux, foot-candle, and EV measurements. (iPhone/iPad app by ZeroPlay Ltd..)

- Source: https://appshunter.io/ios/app/light-meterlux-meter/id6759604310 (this page in markdown: same URL + `.md`)
- Developer: [ZeroPlay Ltd.](https://appshunter.io/developer/1500119722)
- Category: Utilities, Photo & Video
- Price: Free with in-app purchases
- Rating: 5.00/5 from 2 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.1 · 113 MB
- Languages: Russian, Hindi, Vietnamese, American English, Arabic, Hungarian, Dutch, Greek, Danish, Hebrew and 23 more
- Released: 2026-03-21
- Data updated: 2026-08-26
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/light-meterlux-meter/id6759604310/reviews.md

## What is Light Meter・Lux Meter?

LUX METER — LIGHT LEVELS IN LUX AND FOOT-CANDLES

Lux Meter is a camera-based light meter for illuminance. Aim the rear camera at a surface and read the level in lux and foot-candles, plus EV at ISO 100 — desk lighting, a grow light over houseplants, a scene for an analog camera.

WHY THE NUMBER IS WORTH TRUSTING

▸ Metering method always 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 against flicker.
▸ No fresh frame for 2 seconds reads Stale; unusable metadata reads Error.
▸ Moving the target, changing zoom or lens, returning from background or recalibrating restarts the window.
▸ Nothing saves or samples until the reading is valid and stable.

ROOM AND WORKPLACE LIGHT LEVELS

Pick the space or task, then run the five-point survey: five samples across the working plane, each held until stable, 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 room 1000+, bedroom 50–150, plus kitchen, bathroom, garage, retail floor and restaurant — practical guidance, never legal certification.

GROW LIGHTS, PPFD AND DLI FOR PLANTS

Measure at the leaf plane of one plant and decide for that plant: pick the plant, the light source and the photoperiod, and the reading becomes 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 and strawberry. 5 light sources: sunlight, white LED, fluorescent, HPS, metal halide. The sample log marks periods it did not cover, so a thin number never passes for a full day.

EXPOSURE FOR PHOTO AND VIDEO

The same reading solves exposure: 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 gives the exact result, the nearest setting your gear really has and the residual error in stops — out of 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.

RECORDS AND CSV EXPORT

Readings, surveys, DLI estimates, comparisons and monitoring all land in one history list — each with its method, readiness state, calibration and mode inputs. Page the archive, export to CSV.

ALSO INSIDE

▸ Lock a reading; switch lux ↔ foot-candles in one tap
▸ Lux reference — 16 environments, 0.1 lx full moon to 130,000 lx direct sun
▸ EV reference — 11 scenes, −6 EV starlight to +18 EV snow
▸ A/B comparison — capture A, move to B, get the EV difference and brightness ratio
▸ Continuous monitoring — min / avg / max trend, real sampling interval, samples and missed samples, markers; background time logs as a gap
▸ Guided calibration — enter a reference value, aim at a uniform surface, wait for stable, apply the offset

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 photos taken or stored, nothing uploaded, no account, and readings leave your device only in a CSV you export.

Free covers the live reading and its readiness state; Pro removes ads and unlocks every workflow.

Point, wait for stable, read the number — and stop guessing how much light really reaches that desk or that leaf.

Terms of Use: https://zeroplay.io/docs/legal/terms-of-service

Privacy Policy: https://zeroplay.io/docs/legal/privacy-policy

## Key features

- Real-time lux, foot-candle, and EV readings
- Visual brightness indicator
- Check lighting standards for spaces
- Calculate DLI and PPFD for plants
- Continuous recording and trend charts
- Save and compare measurements

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly | $19.99 | per month |
| Weekly | $7.99 | per 7 days |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/light-meterlux-meter/id6759604310/reviews.md

### 1/5 — 会恶意扣98块钱的软件，避雷

*2026-07-13*

当天第一次下载这个软件，提示三天免费试用，后面按98每个月扣费，我下载后发现不好用，立马选择了取消订阅，此时还在3天免费试用期内，然后第二天发现这个软件偷偷刷了我抖音绑定的银行卡98元，我多次联系退款，说我并不想定产品联系人拒绝，苹果官方申请多次也拒绝退款，请大家一定要避雷

**Developer response:** 您好，给您造成麻烦非常抱歉。关于扣款和退款操作确实是由苹果负责，我们无法操作也没有拒绝。如果在苹果申请退款遇到问题可联系苹果官方说明情况要求退款。

## Frequently asked questions about Light Meter・Lux Meter

### What is Light Meter used for?

Light Meter is a utility app that turns your phone into a professional light measurement instrument. It provides accurate, real-time readings in lux, foot-candle, and EV, helping you assess lighting conditions for various needs.

### Does Light Meter have ads?

No, Light Meter does not contain advertisements. The app is free to try all features, with a subscription required only for continued access after the trial period.

### What are the subscription details for Light Meter?

All features of Light Meter can be tried for free. A subscription is necessary for continued use beyond the trial period. Specific pricing and tier details are available within the app.

### Can Light Meter help with plant care?

Yes, Light Meter is designed to assist with plant care by calculating Daily Light Integral (DLI) and PPFD estimates. It also includes a plant compatibility guide to help you find ideal spots for various plants.

### What lighting standards does Light Meter check?

Light Meter can instantly check if your space meets lighting requirements for environments like offices (300–500 lux), classrooms (300–500 lux), libraries (500+ lux), and hospital wards (100–200 lux), providing clear pass/fail indicators.

### What devices is Light Meter compatible with?

Light Meter is available for iPhone, iPad, and iPod. It runs on iOS devices and is suitable for users who need precise light measurements on the go.

### How often is Light Meter updated?

The latest version of Light Meter is 1.1, which was last updated on April 21, 2026. Updates typically include improvements and new features to enhance the user experience.

### What is the age rating for Light Meter?

Light Meter has an age rating of 4+. This indicates it is suitable for users of all ages and does not contain content that would be inappropriate for children.

## Version history (last 5 releases)

### 1.4 — 2026-08-08

Bug fixes and performance improvements for a smoother experience.

### 1.3 — 2026-07-13

Bug fixes and performance improvements for a smoother experience.

### 1.2 — 2026-07-06

Bug fixes and performance improvements for a smoother experience.

### 1.1 — 2026-04-21

Bug fixes and performance improvements for a smoother experience.

### 1.0 — 2026-03-21

No release notes.

## More apps by ZeroPlay Ltd.

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- [Cube Solver - 50+ Puzzles](https://appshunter.io/ios/app/cube-solver-50-plus-puzzles/id6744553308)
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All apps by ZeroPlay Ltd.: https://appshunter.io/developer/1500119722

## Related topics

[luxometro](https://appshunter.io/ios/topics/luxometro) · [photone grow light meter](https://appshunter.io/ios/topics/photone-grow-light-meter) · [light meter lux meter](https://appshunter.io/ios/topics/light-meter-lux-meter)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*