Light Meter LM-3000

Light Meter LM-3000

Simple & accurate measurement!

2.6K ratings
208 reviews
Free
In-App Purchases

Details

Released
March 9, 2021
Updated
October 22, 2026
Light Meter LM-3000 video #1 for iPhone
Light Meter LM-3000 screenshot #2 for iPhone
Light Meter LM-3000 screenshot #3 for iPhone
Light Meter LM-3000 screenshot #4 for iPhone
Light Meter LM-3000 screenshot #5 for iPhone
iphone
ipad
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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
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What users say about Light Meter LM

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What's New in Light Meter LM

4.4.7

October 22, 2026

Fixed low light measurements for the latest iPhone 18 Pro.

2

Subscriptions & In-App Purchases

Continuous Charging

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

$3.491 Month
How to cancel Light Meter LM subscription ⁉️

User reviews

Бесполезное приложение

У меня давно оно было скачено и я пользовалась иногда для проверки люксов. Сейчас наступила зима, купили лампы. Иии села какая-то внутрення батарея приложения и чтобы ее зарядить надо купить подписку втф
Я даже не знаю почему она села…. Проще купить на маркете нормальный люксометр, потому что подписка стоит дороже чем сам прибор. 🤡
На 1 или 2 раза приложения хватит , но бред полный. Можно просто вставить рекламу в приложение, а не скачать на раз и удалить
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Response from developer

Ксения, спасибо, что так долго пользуетесь приложением! 💡 Батарея села не из-за сбоя: «Стартовая батарея» — это бесплатный пробный период минимум на два дня измерений (считаются только дни, когда вы действительно измеряете свет). При редких проверках люксов он растянулся надолго, а теперь закончился. Подписка — не единственный вариант: можно разово зарядить батарею на 48 часов или один раз купить безлимитную батарею — навсегда, без подписки. Люксометр по цене безлимитной батареи найти можно, но точным он не будет — хороший прибор стоит от 150 $. LM-3000 откалиброван в лаборатории отдельно под каждую модель iPhone и iPad, а телефон всегда с собой. Рекламы нет намеренно: она раздражает, а рекламные сети передают данные пользователей третьим лицам. Анжела и команда Lightray

Excellent App with Room for Innovation

Great work by the developer! The app is well-designed and very useful. One suggestion would be to add surface luminance (cd/m²) measurement using the smartphone’s back camera through OECF-based calibration or reference luminance meter calibration. This could be valuable for road safety research.

Response from developer

Thank you, Raoniar! Glad the app is useful to you 💡 Ask explained to you already via email: Luminance from the rear camera is physically feasible, and road lighting (EN 13201) is a good use case for it. It would need its own calibration chain per device model and lens, though (absolute factor, spectral correction per light source, veiling glare), so it isn't on our roadmap for now. But thanks for sharing! We read every review, and this suggestion is definitely noted. Dennis and the Lightray team

Overpriced

Gets a 3/5 since I can buy an actual light meter for the same price on Amazon. Y’all made a cheap bit of code and your pricing should reflect that.

I’m back!

It was really useful! Thanks

False positive review bombs

Stay away. This app charges 7.99 after using it for a few minutes and locks you out of ALL features

Developer apps

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.