LUX - Illuminance Meter
User Guide
Basic Usage
- Launch the app to automatically start measuring illuminance.
- The current illuminance is displayed in lux on screen.
- Point the camera towards the area you want to measure.
- Long press the screen to freeze (lock) the value.
Measurement Tips
- Keep the camera steady — Shaking causes the readings to fluctuate. Place the device on a stable surface for more accurate results.
- Avoid pointing directly at light sources — Extremely bright light sources may exceed the camera sensor's limits, resulting in inaccurate readings.
- Low light conditions — In very dark environments, accuracy may decrease due to the camera sensor's sensitivity limits.
For higher precision, we recommend using a professional illuminance meter. This app displays approximate values calculated from the smartphone camera.
Lux Value Reference
| Environment | Lux Value |
|---|---|
| Moonlight | ~1 lux |
| Dim room | ~50 lux |
| Typical office | 300–500 lux |
| Bright indoor | 500–1,000 lux |
| Overcast outdoor | ~10,000 lux |
| Direct sunlight | ~100,000 lux |
About LUX Pro
LUX Pro is a paid subscription plan. Subscribers get the following benefits:
- No banner ads
- No interstitial ads
How to Purchase
Access the LUX Pro purchase screen from the Settings tab in the app.
Restore Purchase
After changing devices or reinstalling the app, use the "Restore Purchase" button in Settings. You must be signed in with the same Apple ID.
FAQ
Q. Are the measurements accurate?
A. The readings are approximate values calculated from the iPhone's camera sensor. Accuracy depends on the device's camera capabilities and may not match professional illuminance meters.
Q. How do I cancel my subscription?
A. Go to iPhone Settings > Apple ID > Subscriptions, then select LUX to cancel.
Q. I can't restore my purchase.
A. Make sure you're signed in with the same Apple ID used for the original purchase. If the issue persists, please contact us via the form below.
Q. Is there an Android version?
A. Currently under consideration.
Contact
For questions or bug reports, please contact us: