# Illuminance Meter: Lux PPFD — Foot Candle, Kelvin, Exposure

> iPhone-based light meter for measuring illuminance in lux and foot-candles. (iPhone/iPad app by LEAN ASIA CO., LTD.)

- Source: https://appshunter.io/ios/app/illuminance-meter-lux-ppfd/id6759972986 (this page in markdown: same URL + `.md`)
- Developer: [LEAN ASIA CO., LTD](https://appshunter.io/developer/1815050814)
- Category: Utilities, Photo & Video
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 13 MB
- Languages: American English
- Released: 2026-04-23
- Data updated: 2026-10-12
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/illuminance-meter-lux-ppfd/id6759972986/reviews.md

## What is Illuminance Meter?

PREMIUM — PURCHASE REQUIRED: All features described below are part of Pro and require a purchase: a weekly or yearly auto-renewing subscription, or a one-time lifetime purchase.

Point your iPhone camera at any light and read it in seconds: illuminance in lux and foot-candles, color temperature in Kelvin, photographic EV, and PPFD for your plants. One meter, already in your pocket.

Most light meter apps do one thing. Pocket Lux Meter is the whole bench: a live illuminance meter you can calibrate against a trusted reference, plus a spectrum view, film-photography exposure tables, grow-light conversion, a room uniformity grid, and PDF/CSV reports you can hand to someone. Readings are honest estimates from your camera — the app tells you so, and calibration keeps them close.

WHAT YOU GET
• Know in seconds whether your desk hits the 500 lux an office task needs — a live reading with min, max and average that settles as you sweep the room
• See any bulb's color temperature in Kelvin, so the "warm white" you just bought actually matches the 2700K lamps already in the ceiling
• Walk into a scene with your film camera and leave with a usable exposure — EV turned into ISO, shutter and aperture pairs you can dial straight in
• Find out if your monstera is starving: lux converted to PPFD and DLI for the exact light source, matched against ranges for common houseplants from succulents to ZZ plants
• Prove a room is evenly lit with the grid uniformity test — measure point by point instead of guessing
• Hand a client or facilities team a PDF or CSV report of saved readings, complete with notes, tags and history comparisons

PERFECT FOR
• Film photographers metering scenes without a handheld exposure meter
• Plant owners and growers dialing in LED, HPS, metal halide or fluorescent lights
• Facility managers and office planners checking workspace lighting against reference ranges
• Anyone comparing bulbs, fixing a dim desk or testing a new lamp

WHY NOT JUST BUY A HARDWARE LUX METER?
A decent standalone meter costs real money and lives in a drawer. Your phone is already with you. Calibrate this app once against a reference and it stays useful — and it does what a basic lux meter can't: Kelvin readings, exposure tables, PPFD and DLI conversion, uniformity grids and shareable reports. For regulated or safety-critical work, use certified equipment; for everything else, this is the meter you'll actually have on hand.

PRIVATE BY DEFAULT
Measurements, notes, tags and calibration settings stay in local storage on your device. Camera frames are processed on-device and never saved. No account, no sign-up.

PREMIUM (PURCHASE REQUIRED)
Pocket Lux Meter requires an active plan. Full access unlocks every tool: the live lux/foot-candle/EV meter, spectrum and color temperature view, photography exposure tables, plant PPFD and DLI mode, grid uniformity, lighting standards, quick test, screen brightness test, smart analysis, history comparison, and CSV/PDF export. Choose a weekly subscription, a yearly subscription, or a lifetime one-time purchase. Localized prices are shown in the app before you pay.

Point your camera at the nearest lamp and get your first reading in under ten seconds.

Terms of Use: https://leanstudio.asia/terms-of-use
Privacy Policy: https://leanstudio.asia/privacy-policy
Support: support@leanstudio.asia

## Key features

- Real-time lux measurement with live gauge
- Photography mode for exposure value (EV) calculation
- Plant light mode with recommendations
- Workplace standards verification
- Measurement history with export options
- Spectrum analysis for color temperature and CRI
- Multiple illuminance unit switching

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Yearly | $19.99 | per year |
| Premium Weekly Plan | $3.99 | per 7 days |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime | $39.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/illuminance-meter-lux-ppfd/id6759972986/reviews.md

### 1/5 — Simple et efficace

*2026-08-30*

Je ne suis pas un professionnel et je n’ai pas besoin de valeurs justes. Je m’en suis servi pour comparer un « avant » et un « après ». Les prise de mesure sont assez rapprochées et l’analyse est assez rapide. Cependant, quand la lumière s’éteint ça chute directement, mais quand elle revient le graphique remonte progressivement ça c’est un peu dommage pour vérifier des fluctuations. 
D’autre part, une option que je n’ai pas trouvé mais permettant d’utiliser l’appareil photo frontal serait un plus. Poser la tablette sur une table pour enregistrer la luminosité d’un plafonnier et plus évident que de la garder en main et de viser avec l’appareil photo dorsal. 
En résumé, c’est une application qui mérite quelques améliorations, mais qui fait ce que moi je lui demande, contrairement à celle que j’ai chargé juste avant ou je n’ai rien compris ! (Trop pro avec trop de termes technique.)
Pour ma part, je garde cette appli!

## Frequently asked questions about Illuminance Meter

### What is Light Meter used for?

Light Meter transforms your iPhone into a professional tool to measure illuminance in lux or foot-candles. It's useful for photographers, plant lovers, and ensuring workplace safety by providing accurate light readings.

### Does Light Meter have ads?

Yes, Light Meter contains advertisements. As a free app with in-app purchases, ads are displayed to support its development and features.

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

Light Meter offers a Premium Weekly Plan for $3.99 and a Premium Yearly plan for $19.99, which includes a 3-day free trial.

### Can I export my measurements from Light Meter?

Yes, you can save your readings with date, time, and location. Light Meter allows you to search, filter, compare, and export your measurement data as CSV or PDF files.

### Is Light Meter suitable for professional photography?

Yes, Light Meter includes a dedicated Photography Mode that allows you to calculate exposure values (EV) and understand the exposure triangle, helping you achieve the perfect shot.

### How does Light Meter help with plant care?

The Plant Light Mode in Light Meter helps you check if your plants are receiving the correct amount of light. It also provides recommendations for common houseplants based on their light needs.

### What units does Light Meter support?

Light Meter supports multiple illuminance units, allowing you to switch between lux, foot-candles, and other relevant units with a single tap for your convenience.

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

Light Meter has an age rating of 4+, making it suitable for a wide range of users, including children under parental guidance.

## Version history (last 3 releases)

### 1.0.3 — 2026-10-11

Bug fixes and performance improvements.
Thanks for using the app — your feedback keeps it getting better.

### 1.0.2 — 2026-06-03

Bug fixes and performance improvements.

### 1.0.1 — 2026-04-23

No release notes.

## Apps similar to Illuminance Meter

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| [light meter lux meter](https://appshunter.io/ios/app/light-meter-lux-meter/id6761342728) | — | Free | Utilities |

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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 2026-10-12.*