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Light Meter LM-3000

Light Meter LM-3000

Simple & accurate measurement!

2.6K ratings
201 reviews
🔧 Utilities
Free
In-App Purchases

Details

  • Released
  • Updated
  • March 9, 2021
  • August 25, 2026

Developer

Lightray Innovation GmbH
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iphone
ipad
🧾$0.99 - $19.99
In-App Purchase↘︎
📌Ready
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About

Transform your smartphone into a professional light meter. Measure illuminance and color temperature with scientifically validated accuracy, trusted by professionals. Requires a simple diffuser for precise readings.

✓Measure illuminance (lux/foot-candle)
✓Measure color temperature (Kelvin)
✓Industry-leading accuracy
✓Pre-calibrated for your device
✓Low light sensitivity
✓Save peak reading
✓Custom calibration option
Show original description

What users say

Summarized from real user reviews of Light Meter LM. Based on 2.6K reviews and a 4.5/5 average, it highlights the 5 positives and 5 negatives reviewers mention most about this Utilities app.

Positive things

  • 👍Great app
  • 👍Accurate measurements
  • 👍Easy to use
  • 👍Helpful customer service
  • 👍Useful for science/research

Negative things

  • 🐛Requires diffuser for accurate readings
  • 💰Expensive for a light meter app
  • 🔋Battery/trial period issues
  • 🔍Inconsistent/inaccurate readings
  • 🙄Misleading/deceptive marketing
See all reviews

What's New in Light Meter LM

4.4.5

August 25, 2026

This update makes the LM-3000 more resilient when working with the iOS camera.

Subscription plans

Continuous Charging

Keep the LM-3000 running as long as you're subscribed

$3.491 Month
How to cancel Light Meter LM subscription ⁉️
1

In-App Purchases

$0.99

Single Charge

Charge your LM-3000 battery once

User reviews

Most RecentHighest RatedLowest Rated

Great app

Does what it says
Jay GylJay Gyl

Response from developer

Hi Jay Gyl, Thank you for the five stars! "Does what it says" is honestly the best compliment a measuring instrument can get 😃 Best regards, Dominik and the Lightray team

Ерунда полная

Из за рекламы которая маячит сразу при включении и не уходит,требуя платной подписки,пользоваться не стала.
MonicBellMonicBell

Response from developer

Здравствуйте, MonicBell! Жаль, что первое впечатление оказалось таким — но один момент важно прояснить: рекламы в LM-3000 нет вообще. Экран, который Вы видели, это «заряд батареи» приложения, то есть варианты оплаты. И подписка — лишь один из них: есть разовая покупка на два дня (≈$0,99) и разовая покупка навсегда (≈$19,99). При установке приложение даёт бесплатную «стартовую батарею» минимум на два активных дня измерений, так что сразу после установки измерять можно бесплатно. Если экран не закрывается и не даёт работать — так быть не должно. Напишите нам на support@lightray.io с моделью iPhone и версией iOS, мы разберёмся. Как устроена «батарея», подробно здесь: lightray.io/lightmeter/#purchases-explained С уважением, Dennis и команда Lightray

Nah this a’int it

Just make a light ad based version for hobbyists and occasional use; the battery stuff is actually just annoying and stupid and not as clever as they would like you to think and needlessly complex. Keep the pro full version as is.
RGPATXRGPATX

Good app but

Meter worked well but forced me to purchase time to continue use.
lepersqualllepersquall

The best ever light meter only available in this platform

Absolutely correct accuracy and 100% authentic readings and most importantly available in free this is an awesome app the first time im reviewing a good application in app store hats off developers
Rohit54Rohit54

Response from developer

Hi Rohit54, Thank you so much for your review and the very kind words 😍 It makes us really happy to hear that you appreciate the hard work we've put into the app 🙏 The highest possible accuracy is our main goal, and it's great to hear that our efforts are valued 🫶 All the best, Angela and the Lightray team

See 196 more reviews

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User experience

🐞

Reported Bugs

3 issues

Diffuser not recognized even when used

Bug

App locks up/crashes

Bug

Constant diffuser pop-up interruptions

Bug
✨

Requested Features

3 requests

Ability to use rear camera

Feature

More flexible diffuser options

Feature

Improved accuracy without diffuser

Feature

FAQ

What does the Light Meter LM-3000 app do?

This app turns your smartphone into a professional-grade light meter. It measures illuminance in lux or foot-candles and correlated color temperature in Kelvin with scientifically validated accuracy, adhering to ISO/CIE 19476 standards.

What are the key features of the LM-3000 app?

Key features include industry-leading accuracy matching professional lux meters, pre-calibration for your specific device, excellent low light sensitivity, the ability to save peak readings, a HOLD function with an acoustic signal, and a custom calibration option to align readings with another meter.

How much does the Light Meter LM-3000 app cost?

The app is free to download and offers a free trial period for two non-consecutive days. After the trial, you can choose from various charging options: a single charge for 48 hours, a monthly subscription for continuous use, or a one-time purchase for unlimited lifetime access.

What are the compatibility requirements for the LM-3000 app?

The app is designed for iPhones and leverages the front-facing camera sensor. It does not require Bluetooth or location permissions. A diffuser is required for accurate measurements, which can be easily made or purchased.

What are common use cases for the Light Meter LM-3000 app?

Common use cases include professional photography for setting correct exposure and color balance, engineering for lighting design and analysis, and by lighting professionals for ensuring accurate illumination levels in various environments. It's also useful for detecting light pollution.