Lux Meter - Light Meter
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About this app
Lux Meter turns your phone into a simple light meter. Using your device's built-in ambient light sensor, it measures the brightness around you in lux (lx) in real time.
What it does
• Real-time lux reading from the hardware light sensor
• Environment guide: tells you whether the light is dark, comfortable, or bright
• Session statistics: minimum, average, and maximum lux
• One-tap reset to start a new measurement
• Clean, easy-to-read display with light and dark themes
Where it helps
• Photography and video: check lighting before a shot
• Indoor plants: see if your plants get enough light
• Home and office: check if a room is bright enough for reading or work
• Sleep environment: confirm your bedroom is dark enough
• Study and teaching: a hands-on way to understand illuminance
How to use
1) Open the app — measuring starts automatically
2) Point your phone toward the light you want to measure
3) Read the lux value and the environment label
4) Tap reset to clear the min / avg / max statistics
Important
• This app requires a device with an ambient light sensor. Most phones have one, but some budget or older devices do not. If your device has no light sensor, the app will tell you and cannot measure brightness.
• Readings are taken from the hardware sensor for general reference. Accuracy varies by device and sensor placement, so values are best used as a guide, not a calibrated laboratory measurement.
Privacy
• The app measures light only on your device. No light data is uploaded or shared.
Supported by banner ads. No account or sign-up required.
What it does
• Real-time lux reading from the hardware light sensor
• Environment guide: tells you whether the light is dark, comfortable, or bright
• Session statistics: minimum, average, and maximum lux
• One-tap reset to start a new measurement
• Clean, easy-to-read display with light and dark themes
Where it helps
• Photography and video: check lighting before a shot
• Indoor plants: see if your plants get enough light
• Home and office: check if a room is bright enough for reading or work
• Sleep environment: confirm your bedroom is dark enough
• Study and teaching: a hands-on way to understand illuminance
How to use
1) Open the app — measuring starts automatically
2) Point your phone toward the light you want to measure
3) Read the lux value and the environment label
4) Tap reset to clear the min / avg / max statistics
Important
• This app requires a device with an ambient light sensor. Most phones have one, but some budget or older devices do not. If your device has no light sensor, the app will tell you and cannot measure brightness.
• Readings are taken from the hardware sensor for general reference. Accuracy varies by device and sensor placement, so values are best used as a guide, not a calibrated laboratory measurement.
Privacy
• The app measures light only on your device. No light data is uploaded or shared.
Supported by banner ads. No account or sign-up required.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Device or other IDs
No data collected
Learn more about how developers declare collection
Data isn’t encrypted
What’s new
Bug fixes
