Lux Light Meter

Measure ambient light levels using your smartphone’s built-in light sensor. Use it to check room brightness, evaluate lighting at your desk or workspace, monitor lighting conditions for plants, or get a rough reference for photography. ■ Key Features - Real-time illuminance display - Switch between lux (lx) and foot-candles (fc) - View minimum, average, and maximum readings at a glance - Graph changes in illuminance over time * Save measurement history and export data as CSV ■ Recommended Illuminance Guide - View recommended illuminance levels for different areas, including living rooms, bedrooms, computer workspaces, and kitchen countertops - Set a target illuminance range and display upper and lower limits on the graph - Automatically indicate whether the current level is "Appropriate", "Too Dark", or "Too Bright" - Reference values are representative levels based on "EN 12464-1" and "JIS Z 9110" ■ History & Export - Save the measurement start date and time, measurement duration, number of data points, and minimum / average / maximum values - Filter and sort records by date - Delete multiple records at once - Export and share measurements as CSV files that can be opened in spreadsheet applications * Add notes to measurement records ■ Settings - Adjust readings using a correction factor and offset to match the readings of your existing illuminance meter - Set the measurement interval from 0.2 seconds to 1 minute - Enable or disable the always-on display - Use a design optimized for both indoor and outdoor viewing, with optional dark mode - Choose where CSV files and screenshots are saved ■ Important Notes - Sensor performance and sensor location vary by device, so measurements should be considered approximate. For applications requiring accurate measurements, please use a calibrated illuminance meter. - On many devices, the ambient light sensor is located near the top of the screen, close to the front-facing camera. Point the sensor toward the light source when taking measurements. - This app cannot be used on devices without an ambient light sensor. - Measurement data is stored loc