# Lux Light Meter: Illuminance — Exposure Meter & ND Calculator

> iPhone lux and illuminance meter with photography and plant light guidance. (iPhone/iPad app by 灿耿 陈.)

- Source: https://appshunter.io/ios/app/lux-light-meter-illuminance/id6790679680 (this page in markdown: same URL + `.md`)
- Developer: [灿耿 陈](https://appshunter.io/developer/1688324562)
- Category: Utilities
- Price: Free with in-app purchases
- Rating: 5.00/5 from 3 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 17 · 4 MB
- Languages: Russian, German (Germany), Japanese, French (France), Chinese (Simplified, China), Chinese (Traditional, Taiwan), American English, Brazilian Portuguese, European Spanish, Arabic and 1 more
- Released: 2026-07-15
- Data updated: 2026-08-26
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/lux-light-meter-illuminance/id6790679680/reviews.md

## What is Lux Light Meter?

Lux Light Meter: Illuminance
A practical lux and illuminance meter for iPhone. Measure ambient light in seconds, check if a room is bright enough for study, work, or home use, and get helpful exposure and plant-lighting guidance when you need it. Core metering works offline.

Key Features:
Ambient light metering - Live lux / fc readings with scene targets that tell you if the light is too dim, about right, or too bright — plus simple tips to adjust
Photography mode (Pro) - Aperture- or shutter-priority suggestions with ISO and exposure compensation so you can dial in exposure faster
Plant mode (Pro) - Estimate PPFD and DLI for common houseplants, with light source and daily photoperiod options
Continuous measure & history - Save single readings, track how light changes over time, and review min, average, and max values
Optional calibration - Fine-tune against a trusted meter; Pro saves separate factors for the front and rear cameras
Units & privacy-friendly storage - Switch between lux and fc; your measurements stay on your device

How to Use:
Open the app, allow camera access, and point your iPhone at the area you want to measure. Switch between Environment, Photography, and Plant modes, then save a reading or run a continuous measurement when you need a longer sample.

Subscription Options:
* Weekly and yearly subscriptions, plus a lifetime purchase
* Payment will be charged to your Apple ID account
* Subscriptions renew automatically within 24 hours before the current period ends
* Manage or cancel anytime in your Account Settings

Clearer readings. Better light decisions.

Terms of Use: https://lightmeter.xzonesoft.com/terms.html
Privacy Policy: https://lightmeter.xzonesoft.com/privacy.html
Contact Us: support@xzonesoft.com

## Key features

- Ambient light metering (lux/fc)
- Photography exposure suggestions
- Plant light (PPFD/DLI) estimation
- Continuous measurement and history
- Optional meter calibration
- Privacy-friendly local storage

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Annual Subscription | $7.99 | per year |
| Weekly Access | $1.99 | per 7 days |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Access | $4.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/lux-light-meter-illuminance/id6790679680/reviews.md

### 5/5 — 无障碍优化

*2026-08-12*

感谢作者对软件进行了无障碍适配，现在视障用户也能无障碍的用这款软件来判断室内的光线了，非常好。

**Developer response:** 感谢您的建议跟肯定，我们会持续优化❤️

### 5/5 — 艺术品拍摄测光

*2026-08-07*

软件设计可能是为了阅读学习或者日常生活休息中使用。使用了一下表现不错。个人希望可以增加艺术品拍摄时候的测光功能。

**Developer response:** V1.2版本已经支持艺术品拍摄场景测光啦，可以更新体验，有任何新的建议也欢迎随时反馈给我们，我们会在后续版本进行优化。support@xzonesoft.com

## Frequently asked questions about Lux Light Meter

### What is Lux Light Meter used for?

Lux Light Meter helps you measure ambient light levels in lux or foot-candles. It offers specialized modes for photography to guide exposure settings and for plant care to estimate light needs.

### Does Lux Light Meter work offline?

Yes, the core ambient light metering functionality of Lux Light Meter works offline. This allows you to take readings without an internet connection.

### Can I calibrate Lux Light Meter?

Yes, Lux Light Meter offers optional calibration to fine-tune readings against a trusted meter. Pro users can save separate calibration factors for both front and rear cameras.

### What are the subscription options for Lux Light Meter?

Lux Light Meter offers weekly and yearly subscriptions, as well as a lifetime purchase option. Payments are charged to your Apple ID, and subscriptions renew automatically unless managed in account settings.

### How does Lux Light Meter handle my data?

Lux Light Meter is privacy-friendly, storing your measurements directly on your device. You can switch between lux and foot-candle units as needed.

### What devices is Lux Light Meter compatible with?

Lux Light Meter is designed for iPhone and iPad devices. It requires camera access to function.

### How often is Lux Light Meter updated?

The latest version of Lux Light Meter is 1.1, last updated on July 24, 2026. Updates typically include improvements and new features based on user feedback.

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

Lux Light Meter has an age rating of 4+, making it suitable for a wide range of users. Its utility features are designed for practical application.

## Version history (last 4 releases)

### 1.3 — 2026-08-25

1. Improved VoiceOver: the measurement mode control is now adjustable—swipe up or down to switch.
2. Improved metering experience.
3. Fixed known issues.

If you have any questions, please contact us: support@xzonesoft.com

If you enjoy this update, we’d love your rating and feedback. Your support helps us keep refining the app.

### 1.2 — 2026-08-10

1. Improved measurement mode switching for a smoother experience.
2. Photography mode now includes subject switching, with Standard and Artwork shooting modes.
3. Enhanced accessibility: when VoiceOver is on, live meter readings can be announced aloud.

If you have any questions, please contact us: support@xzonesoft.com

If you enjoy this update, we’d love your rating and feedback. Your support helps us keep refining the app.

### 1.1 — 2026-07-24

1.Support full-screen detection view
2.Fixed known issues

### 1.0 — 2026-07-15

No release notes.

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All apps by 灿耿 陈: https://appshunter.io/developer/1688324562

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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.*