Lux Meter – Light Meter
Illuminance, EV & foot-candle
About
This tool transforms your iPhone into a professional light meter, measuring illuminance in lux and foot-candles in real-time. It offers exposure calculations, color temperature estimates, and various presets for different use cases, all while working offline and without ads.
What's New in Lux Meter
1.1
August 19, 2026
New: Grow Light meter — turn any reading into PPFD and the Daily Light Integral (DLI) for your plants, with light-source presets and plant-care guidance. Also: histogram overlay on by default, a clearer lux/foot-candle switch, and refinements.
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FAQ
Does Lux Meter have ads?
Yes, Lux Meter contains advertisements. This is indicated by the 'hasAds' flag in the application data.
How accurate is Lux Meter?
Lux Meter uses camera-based reflective metering, following the ISO 2720 photographic standard. For best results, calibrate once against a reference and use consistent lighting conditions.
Can Lux Meter be used offline?
Yes, Lux Meter works 100% offline. It does not require an account, tracking, or network connection to function.
What devices does Lux Meter support?
Lux Meter is currently supported on iPhone devices.
What is the age rating for Lux Meter?
Lux Meter has an age rating of 4+.
How often is Lux Meter updated?
The latest version of Lux Meter is 1.1, and it was last updated on August 19, 2026. The release date was July 22, 2026.
What are the different metering modes in Lux Meter?
Lux Meter offers both spot metering, which focuses on the center of the camera's view, and average metering, which analyzes the entire frame.
Can I export my readings from Lux Meter?
Yes, you can save single readings or record sessions over time. These sessions can include notes and location tags, and can be exported as CSV files via the share sheet.