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Lux Light Meter - Luminance

Lux Light Meter - Luminance

Illuminance & Exposure Tool

3 ratings
With Ads
🔧 Utilities
📊 Productivity
Free
With Ads
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Details

  • Released
  • Updated
  • March 3, 2026
  • July 7, 2026

Features

Developer

Kyu-Hee Jang
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Lux Light Meter - Luminance screenshot #1 for iPhone
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About

This tool transforms your iPhone into a precise light meter, offering multiple modes for various environments and photography needs. It records measurement history, allows for notes and comparisons, and supports CSV export for detailed analysis.

✓Precise ambient light measurement (lux)
✓Multiple measurement modes (Auto, Outdoor, Indoor, Photo)
✓Measurement history with trend charts
✓Add notes and favorites to readings
✓Compare saved readings side-by-side
✓CSV export for data analysis
✓EV exposure value for photographers
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What's New in Lux Light Meter

1.0.19

July 7, 2026

New: a HOLD button to freeze the reading, plus a Grow Light card that estimates PPFD and DLI from lux for your light source and photoperiod. Thanks for the reviews and feedback!

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FAQ

What is Lux Light Meter used for?

Lux Light Meter turns your iPhone into a precise illuminance meter. It measures ambient light in lux and provides exposure values for photographers, with features like measurement history and CSV export.

Does Lux Light Meter have ads?

Yes, Lux Light Meter contains advertisements. As a free utility app, it utilizes ads to support its development and ongoing service.

What devices does Lux Light Meter support?

Lux Light Meter is available for iPhone and iPod touch devices. It is designed to leverage the sensors present on these Apple mobile devices.

How accurate is Lux Light Meter?

The app aims for precise ambient light measurement using Kalman-smoothed sensor readings. It also offers a calibration offset feature for fine-tuning sensor accuracy in ±1 lx steps.

Can I save and review my light measurements with Lux Light Meter?

Yes, Lux Light Meter automatically saves every reading and provides a 7-day trend chart. You can add notes, mark favorites, and compare saved readings side-by-side.

Is Lux Light Meter suitable for professional photography?

Yes, Lux Light Meter includes a 'Photo' mode that provides EV @ ISO 100 readout and suggested shutter speed at f/2.8, making it a useful tool for photographers.

How often is Lux Light Meter updated?

The latest version of Lux Light Meter is 1.0.16, and it was last updated on June 22, 2026. This indicates a recent update, suggesting active development and maintenance.

What languages does Lux Light Meter support?

Lux Light Meter is available in 14 different languages, making it accessible to a global user base. This broad language support enhances its usability for international users.