Measure ambient light levels in lux or foot-candles instantly. Track minimum, average, and maximum readings, and analyze color temperature. Useful for photography, plant care, and general environmental assessment.
2.4.2
November 2, 2026
What's new - 7 more languages LUX now speaks Chinese (Simplified and Traditional), Korean, German, French, Spanish, and Portuguese. - Choose the app language Switch the app's language in Settings, independent of your device language. - Other display improvements and bug fixes
MoreUnlock all premium features with no ads.
LUX is a light meter app that measures illuminance (lux) and color temperature (CCT) in your surroundings. It's useful for checking lighting in rooms, setting up photography, verifying light for plants, and more.
Yes, LUX contains advertisements. These ads help support the development and maintenance of the app.
Premium features include unlimited measurement history with saved Min/Avg/Max values, CSV/PDF export, PPFD/DLI calculation for plants, and continuous logging with charts.
LUX offers subscription plans for Premium access: a Monthly Plan at $1.99/month and a Yearly Plan at $11.99/year. Both plans include a 7-day free trial.
Yes, you can export your measurement data in CSV or PDF formats, but this feature requires a Premium subscription.
LUX is currently supported on iPhones, as indicated by the 'iphone' tag in its device compatibility.
The latest version of LUX is 2.4.2, and it was last updated on November 2, 2026. This suggests a relatively active development cycle.
LUX can be a helpful tool for photographers to check ambient light levels and color temperature, aiding in setup and adjustments for shoots.
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