Frequently Asked Questions
How do I take an accurate measurement?
Point the camera toward the area you want to measure, avoid covering the lens with your hand or body, and keep the phone steady until the reading becomes stable. For ambient light, face the sensor toward the illuminated surface or the light reaching that area.
Why does the app need camera access?
Lux Light Meter: Illuminance estimates illuminance using the camera sensor. Measurement will not work without camera permission. If you previously denied it, open iOS Settings → Lux Light Meter: Illuminance → enable Camera.
How accurate are the readings?
Phone-based readings are estimates for everyday reference. Results can vary by device model, lens, covering, color temperature, and lighting conditions. They cannot replace a calibrated professional illuminance meter or certified inspection. You can improve consistency via optional calibration in Settings.
What are Environment, Photography, and Plant modes?
Environment mode shows lux / fc with scene targets and suitability tips. Photography mode (Pro) suggests exposure parameters such as ISO, aperture, and shutter. Plant mode (Pro) estimates PPFD and DLI for common houseplants.
Does the app work offline?
Yes. Core measurement, saving records, and viewing history work offline. An internet connection is only needed for App Store subscriptions and purchase restoration.
What's included in Pro?
Pro unlocks photography metering, plant lighting analysis, continuous measurement trends, unlimited history, and independent calibration for front and rear cameras. You can try core environment measurement without purchasing first.
How do I restore my purchases?
Open the subscription / membership page in the app and tap "Restore Purchases". This restores purchases associated with your Apple ID.
How do I cancel my subscription?
Subscriptions are managed through your Apple ID. Go to Settings → [Your Name] → Subscriptions, find Lux Light Meter: Illuminance, then tap "Cancel Subscription".
Technical Support
Device Compatibility
Lux Light Meter: Illuminance supports recent iOS versions and is designed for iPhone. If you encounter compatibility issues on a specific device, please contact our support team.
Troubleshooting
If you experience issues with the app, please try the following steps:
- Make sure your app is updated to the latest version
- Confirm Camera permission is enabled
- Restart the app, then restart your device
- If the problem persists, try uninstalling and reinstalling the app
Note: Uninstalling the app will remove locally saved measurement records and calibration settings.
Contact Us
If you have any questions, suggestions, or need assistance, you can contact us through:
常见问题
如何测得更可靠的结果？
将摄像头朝向要测量的区域，不要用手或身体遮挡镜头，并保持手机稳定，等待读数稳定。测量环境光时，请面向被测表面或到达该处的光线方向。
为什么需要相机权限？
光度计通过相机传感器估算照度。没有相机权限将无法测量。若曾拒绝授权，请前往 系统设置 → 光度计 → 开启相机权限。
读数有多准确？
手机测量结果为估算值，仅供日常参考。不同机型、镜头、遮挡、色温与光照条件都会影响结果，不能替代经校准的专业照度计或法定检测。可在设置中进行可选校准，以提高本机一致性。
环境、摄影、植物模式有什么区别？
环境模式显示 lux / fc，并结合场景目标给出是否合适的建议。摄影模式（Pro）提供 ISO、光圈、快门等曝光建议。植物模式（Pro）估算常见室内植物的 PPFD 与 DLI。
应用是否支持离线？
是的。核心测量、保存记录与查看历史均可离线使用。仅在订阅购买与恢复购买时需要网络连接。
Pro 包含哪些功能？
Pro 解锁专业摄影测光、植物光照分析、连续测量趋势、无限历史记录，以及前后摄像头独立校准。您可以先免费完成核心环境测量，再决定是否升级。
如何恢复购买？
进入应用内的订阅 / 会员页面，点击“恢复购买”。这将恢复与您的 Apple ID 关联的购买记录。
如何取消订阅？
订阅通过您的 Apple ID 管理。在设备上前往 设置 → [您的姓名] → 订阅，找到光度计，然后点击“取消订阅”。
技术支持
设备兼容性
光度计支持较新的 iOS 系统，主要面向 iPhone。如果您在特定设备上遇到兼容性问题，请联系我们的技术支持团队。
故障排除
如果应用出现问题，请尝试以下步骤：
- 确保应用已更新至最新版本
- 确认已开启相机权限
- 重启应用，然后重启设备
- 如果问题仍然存在，请尝试卸载并重新安装应用
注意：卸载应用会删除本地保存的测量记录与校准设置。
联系我们
如果您有任何问题、建议或需要帮助，可以通过以下方式联系我们：