# Lumu Light Meter — Pro color and flash meter

> Professional light meter for photography and videography with hardware integration. (iPhone/iPad app by Lumu d.o.o..)

- Source: https://appshunter.io/ios/app/lumu-light-meter/id730969737 (this page in markdown: same URL + `.md`)
- Developer: [Lumu d.o.o.](https://appshunter.io/developer/912288615)
- Category: Photo & Video, Utilities
- Price: Free with in-app purchases
- Rating: 3.40/5 from 99 App Store ratings · 106 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 52 MB
- Languages: American English, Arabic, French (France), German (Germany), Japanese, Norwegian Bokmål, Swedish
- Released: 2013-11-13
- Data updated: 2026-08-26
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/lumu-light-meter/id730969737/reviews.md

## What is Lumu Light Meter?

The light metering tool for every great image maker. 

Use the standalone app as a reflective light meter or use it in combination with  Lumu Power hardware for professional Flash and Color Temperature measurements.

Lumu Power is an easy-to-use digital incident color and light meter that works seamlessly with the free Lumu app to deliver Color Temperature, Illuminance, Spot, Ambient, and Flash Exposure metering functionality on your iPhone.
A new expression of what a light meter can be, Lumu meets the needs of enthusiasts, professionals, and students who find existing light metering solutions too bulky, expensive, and complicated.

“The Lumu Power is without any doubt the most full featured light meter I have ever owned. It’s tiny, it weighs hardly anything, it manages to offer a feature set that expands way beyond what most will ever need from such a device.” - www.35mmc.com



Key features:

- SPOT METERING: Use your phone’s camera as a reflective light meter.


With Lumu Power:

- PHOTO SINGLE mode: Giving you exact parameters: exposure time, f-number, ISO, EV, lux.
- PHOTO MULTI mode: Calculating average value or contrast between multiple measurements.
- PHOTO PINHOLE mode: Measuring exposure time for custom pinhole camera settings.
- CINE/VIDEO mode: Set FPS, F-number, exposure time and ISO. Get the values for the ambiental light.
- FLASH EXPOSURE: See the graph of flash duration, measure its intensity.
- COLOR TEMPERATURE: Read light Color temperature in Kelvin and Green/Magenta shift.
- CHROMATICITY: See light colour in CIE1931 diagram and get X,Y,Z coordinates.
- ILLUMINANCE mode: showing incident light level in lux / foot-candle values.
- NOTES: Store all your measurements together with geo-location, custom notes and your photo in one place.

+ ND FILTERS, EXPOSURE COMPENSATION and more…

Visit http://lu.mu/ to learn more.

## Key features

- Standalone reflective light meter
- Flash and color temperature metering
- Photo and cine/video modes
- Spot metering
- Color temperature in Kelvin
- Store measurements with notes

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Power to Pro Upgrade | $229.99 | one-time |
| Lite to Pro Upgrade | $249.99 | one-time |
| Lite to Power Upgrade | $69.99 | one-time |


## What do users think of Lumu Light Meter?

Overall sentiment: mixed

**Pros**

- ✨ Accurate light metering
- ✨ Precise color meter readings
- 👍 Intuitive and clean UI
- 👍 Great for film photography
- 👍 Convenient pocket-sized tool
- 👍 Good for architectural work
- 👍 Useful for spot metering
- 👍 Replaces handheld meters
- 👍 Good low-light capabilities
- 👍 Functional and well-designed app
- 👍 Cost-effective solution

**Cons**

- 😞 Terrible customer service
- 😞 Unresponsive support
- 😞 Expensive hardware
- 😞 Misleading advertising
- 😞 Inconsistent accuracy
- 😞 Color meter not accurate
- 😞 No setup instructions
- 😞 App unusable for film
- 😞 Forced upgrades
- 😞 Discontinued product issues
- 😞 Device not recognized after updates
- 😞 Connection issues
- 😞 Hardware falls off easily
- 😞 Paid features not unlocked
- 😞 High price for features
- 😞 Software issues with older devices

**Commonly reported bugs**

- 🐛 LUX value shown as FootCandle
- 🐛 ISO keeps changing when metering
- 🐛 Color temp readout option disappeared
- 🐛 Error when factory resetting module
- 🐛 Cannot read CCT
- 🐛 App no longer recognizes original Lumu
- 🐛 Photo Ambient mode turns off
- 🐛 Device not recognized after app update
- 🐛 High-pitched squeal on app open
- 🐛 Loud painful high frequency noise with earphones
- 🐛 Saved files not found
- 🐛 App not working with older iPhones
- 🐛 Exposure compensation backwards
- 🐛 Extremely high pitched squeal

**Most requested features**

- 💡 Aperture priority mode
- 💡 Ability to lock aperture
- 💡 Analog style shutter speed/aperture display
- 💡 Option to see all equivalent exposure settings at a glance
- 💡 Ability to take two readings and see difference in stops
- 💡 Use phone's volume button to take reading
- 💡 Add lower ISO options (below 50)
- 💡 Half-stop increments for ISO/aperture
- 💡 Video mode
- 💡 Location tracking for readings
- 💡 Sync only on Wi-Fi setting

## Recent user reviews (10 of 106)

All indexed reviews: https://appshunter.io/ios/app/lumu-light-meter/id730969737/reviews.md

### 4/5 — Lumu Update

*2026-05-06, version 3.3.6*

Hallo ihr lieben Lumus ;)

Ich gehöre zu denen, die Lumu noch mit den ersten iPhones verwendet haben. Nun habe ich mein Klinkenstecker-Lumu gefunden und suche einen Adapter auf die neuen Steckverbindungen für iPhone 14 und 17. 

Schon mal danke für eurer Hilfe.

### 1/5 — Misleading

*2025-12-23, version 3.3.6*

This is an advert for a colour meter and a spot light meter app. It is not a colour meter.

### 1/5 — disgrace

*2025-08-14, version 3.3.6*

Can not measure flash , just measures when a pressing buton. 250 euros flew away

### 5/5 — Great but

*2025-05-17, version 3.3.6*

Great but one broke they would not replace it so I bought another.
Then that one broke. Very expensive for plastic housing

### 5/5 — Best Cine light meter

*2025-03-19, version 3.3.6*

This is great app, and LuMu hardware is working great (exceptionally precise). I’ve compared it to Sekonic 858d and it’s giving more precise readings in light levels.
Color meter is in par with more expensive professional meters.
Great to see they are back on app store!!

### 5/5 — IMPORTANT ISSUE

*2025-03-12*

This is great app, and LuMu hardware is working great (exceptionally precise) however there is a issue with Illumination section in app, specifically when measuring LUX value! It seems that LuMu app shows Lx value as FootCandle. I’ve compared it with Seconic L858d and it’s 10.7 times lower than it should be, which is exactly conversion number for Lx/Fc ratio!
So in conclusion, it’s great, precise tool, just beware that app shows Lx value in Fc.

### 5/5 — Wow

*2025-03-10, version 3.3.6*

Listen, I never write app reviews. I’ve never even thought to write an app review. But this is probably one of the greatest, feature rich apps I’ve ever used in any use case. Not only that, but it’s also so visually pleasing to look at, not to mention super well designed and laid out. Five enthusiastic stars!!

### 5/5 — Супер

*2025-01-01, version 3.3.6*

Отличный экспонометр!
Для плёночных фотокамер - то что надо!
Спасибо разработчикам.

### 5/5 — Best light meter app

*2024-11-24, version 3.3.6*

This is the best light meter app, particularly for film photography. It is minimal and lets you confine F stops to better match older analog cameras. To the developer - please keep this updated!

### 5/5 — Mega zufrieden

*2024-10-30, version 3.3.6*

Mit der App kann man arbeiten 📷 !!!

## Frequently asked questions about Lumu Light Meter

### What does the Lumu Light Meter app do?

The app functions as a standalone reflective light meter using your phone's camera. It also integrates with Lumu Power hardware to provide professional-grade measurements for flash exposure, color temperature, illuminance, and more, catering to both photo and video needs.

### What are the key features of the Lumu Light Meter app?

Key features include standalone spot metering, and when used with Lumu Power hardware, it offers modes for single and multi-shot exposure, pinhole camera settings, cine/video exposure, flash analysis, color temperature readings, chromaticity, and illuminance measurements. It also allows for storing measurements with notes and geo-location.

### How is the Lumu Light Meter app monetized?

The app itself is free to download and use as a basic reflective light meter. However, advanced features and professional metering capabilities, particularly those requiring the Lumu Power hardware, are unlocked through in-app purchases.

### What devices is the Lumu Light Meter app compatible with?

The app is designed to work seamlessly with iPhones. For its full professional functionality, it requires the Lumu Power hardware, which is specifically designed to connect with and enhance the app's capabilities.

### Who would benefit from using the Lumu Light Meter app?

This app is ideal for photographers and videographers, from enthusiasts to seasoned professionals and students. It's particularly useful for those who find traditional light meters too bulky, expensive, or complicated, offering a portable and feature-rich alternative.

## Version history (last 5 releases)

### 3.3.6 — 2022-03-17

Hey Lumunauts,
Thanks for using Lumu Light Meter!

This is just a quick update that fixes a crash when using the app on iOS 12.

As always, any feedback, suggestions or advice can be sent directly to support@lu.mu.

### 3.3.5 — 2022-03-11

Hey Lumunauts,
We fixed a few minor bugs and issues that will make the app work more reliably.

As always, any feedback, suggestions or advice can be sent directly to support@lu.mu.

### 3.3.4 — 2020-06-20

Hey Lumunauts,
Thanks for using Lumu Light Meter!

Here's what's new:
- Calculated parameters get updated when EV compensation changes
- EV compensation menu stays on the last used section
- Support for system-wide Dark Mode
- Minor bugfixes and improvements

We hope you enjoy this update, and if you run into any troubles or have a suggestion for the app, let us know at app@lu.mu.

### 3.3.3 — 2020-02-06

Bugfixes and improvements.

### 3.3.2 — 2019-07-13

Hey Lumunauts,
Thanks for using Lumu Light Meter!
Here's what's new:
- minor bugfixes
- Japanese, Norwegian, Swedish, German, French and Arabic translations

We hope you enjoy this update, and if you run into any troubles or have a suggestion for the app, let us know at app@lu.mu.

## Apps similar to Lumu Light Meter

| App | Rating | Price | Category |
| --- | --- | --- | --- |
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| [Luxilux Light Meter](https://appshunter.io/ios/app/luxilux-light-meter/id1487384157) | 4.9 (75) | $5.99 | Photo & Video |
| [Pocket Light Meter](https://appshunter.io/ios/app/pocket-light-meter/id381698089) | 4.5 (1,045) | $9.99 | Photo & Video |

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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.*