# Light Meter: Lux-525 Pro — Measure light intensity & cct

> Phone-based light meter for illuminance, color temperature, and PPFD/PAR. (iPhone/iPad app by Andrey Ivankin.)

- Source: https://appshunter.io/ios/app/light-meter-lux-525-pro/id1636117065 (this page in markdown: same URL + `.md`)
- Developer: [Andrey Ivankin](https://appshunter.io/developer/1615973131)
- Category: Utilities, Lifestyle
- Price: Free with in-app purchases
- Rating: 4.46/5 from 113 App Store ratings · 9 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.5 · 17 MB
- Languages: English
- Released: 2023-02-28
- Data updated: 2026-08-22
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/light-meter-lux-525-pro/id1636117065/reviews.md

## What is Light Meter?

Lux-525 Pro – universal, highly-precise, and easy to use light meter.

- Requires no additional equipment, everything you need is already in your phone
- Calibrated with professional light meter
- Smart algorithm provides unsurpassed accuracy in all conditions
- Real-time measurements of illuminance, color temperature, PPFD/PAR, DLI and luminous flux
- Large collection of light sources necessary for accurate calculation of PPFD/PAR and DLI
- Built-in calculator for convenient and precise calculation of various illumination parameters (PPFD, DLI, Lux, Fc, Lumens)
- Share your measurements via a text message or email or save them to your phone

Lux-525 Pro is the best-in-class digital light meter on the phone. It is intended for personal use and may not fully replace industrial-grade light meters.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://n17dev.web.app/light-meter/policy.html

## Key features

- Real-time illuminance measurement
- Color temperature measurement
- PPFD/PAR and DLI calculation
- Built-in illumination calculator
- Share and save measurements
- No additional equipment needed

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Monthly Subscription | $3.99 | per month |
| Premium Monthly Subscription | $4.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium Lifetime Subscription | $19.99 | one-time |
| Premium Lifetime Subscription | $29.99 | one-time |


## Recent user reviews (9 of 9)

All indexed reviews: https://appshunter.io/ios/app/light-meter-lux-525-pro/id1636117065/reviews.md

### 5/5 — Simple yet interesting

*2025-12-20, version 1.1*

So far what I needed was to read fixtures in a classroom and worked for this simple task

### 1/5 — Need to pay

*2025-11-15*

You need to pay to use anything beyond lux.

### 5/5 — Bern

*2025-07-16, version 1.1*

Just right

### 1/5 — Way off!

*2024-12-30, version 1.1*

Using a spider farmer g5000 grow light sitting at 24” above canopy pulling 200 watts at 40% in 4th week after seed popped soil surface. Leaves are praying but level with eye. This app says I’m at 70 ppfd. Wouldn’t suggest this app to nobody. Doesn’t even reach suggested ppfd sitting right under light at 100%. You use this and you’ll fry your plants crispy for sure.

### 5/5 — Excellent light measure

*2024-05-29*

Very easy to use and excellent light meter. It is also reasonably accurate and no big fluctuations when you hold your phone steadily in front or under the source as the case may be. Works for LED, incandescent, natural sun etc. No required diffuser attachments. No muss no fuss. Totally decent application!

**Developer response:** We are grateful for your positive feedback! We are constantly working to improve our light meter, and your support is very important to us. Thank you for choosing our app!

### 1/5 — Poor App Support

*2024-01-05, version 1.0*

The App has no instructions or documentation to show how to use the meter. Also super limited capabilities unless you buy the paid version. I will be deleting the app from my device.

### 1/5 — Measures much lower values than a calibrated light meter

*2023-12-20, version 1.0*

I tried to see if this could replace a calibrated light meter, but the answer is a definite NO. The measured values are 1/2 to 1/3 of what the light meter reads for a LED test source. At very high flux levels (~10 klux) the values are lower by a factor of 10.

### 1/5 — Nah

*2023-06-06*

Inaccurate and misleading with no instructions or diffuser settings.

### 2/5 — inaccurate for grow lights

*2023-04-22, version 1.0*

I tried this app with high hopes but the ppfd is so much off from what spider farmer claims that it’s unusable. also have to pay monthly feels like a rip off

## Frequently asked questions about Light Meter

### What does the Lux-525 Pro app do?

The Lux-525 Pro app is a universal, precise, and easy-to-use light meter that utilizes your phone's built-in sensors. It measures real-time illuminance, color temperature, PPFD/PAR, DLI, and luminous flux without requiring any additional equipment.

### What are the key features of this light meter app?

Key features include real-time measurements of illuminance, color temperature, PPFD/PAR, and DLI. It also offers a built-in calculator for various illumination parameters and allows users to share or save their measurements.

### Is Lux-525 Pro free to use?

The app is free to download and use, with in-app purchases available for advanced features or full functionality. The specific pricing for in-app purchases can be found within the app store listing.

### What kind of devices is Lux-525 Pro compatible with?

This app is designed for mobile devices and requires built-in sensors to function. Specific compatibility details, such as supported operating system versions, are typically listed on the app's page in the app store.

### Who would benefit from using the Lux-525 Pro app?

This app is ideal for photographers, individuals growing plants indoors, or anyone needing to analyze ambient light conditions for various purposes. It provides accurate measurements for understanding light intensity and quality.

## Version history (last 4 releases)

### 1.3 — 2026-04-15

bug fixes and algorithm improvements

### 1.2 — 2026-01-20

bug fixes and algorithm improvements

### 1.1 — 2024-05-27

bug fixes and algorithm improvements

### 1.0 — 2023-03-01

No release notes.

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## More apps by Andrey Ivankin

- [Stud Finder & Metal Detector](https://appshunter.io/ios/app/stud-finder-and-metal-detector/id1590127973)
- [Denoise.FX for Audio & Video](https://appshunter.io/ios/app/denoisefx-for-audio-and-video/id1623119654)
- [Frame Grabber: Best Shots](https://appshunter.io/ios/app/frame-grabber-best-shots/id6756608583)

All apps by Andrey Ivankin: https://appshunter.io/developer/1615973131

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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 2026-08-22.*