Lux Meter - Light & EV Meter

Lux Meter is a precise, professional light measurement tool and photography exposure calculator for your Android device.

Whether you need to check room illuminance for workplace safety, measure grow light levels for indoor plants, or calculate exact exposure values (EV) for photography, Lux Meter delivers accurate, real-time light readings in both Lux (lx) and Foot-Candles (fc).

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🌟 KEY FEATURES
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⚡ DUAL HARDWARE & CAMERA METERING
• Front Light Sensor: Reads ambient illuminance hitting your screen for general room lighting.
• Rear Hardware Sensor: Uses your device's secondary rear sensor (available on flagship devices like Galaxy Ultra & Pixel) to point directly at light sources while viewing the screen.
• Back Camera Metering: Measures reflected light through your camera lens to estimate Exposure Value (EV), ISO, and shutter speed.

📊 REAL-TIME ARC GAUGE & LIVE CHART
• Logarithmic Arc Gauge: Smooth 0 to 100,000+ lx scale for indoor ambient light to direct sunlight.
• Live History Graph: Track illuminance trends over time with real-time curve graph and customizable Y-axis scale.
• Session Statistics: Instant MIN, AVERAGE, and MAX illuminance records.

📸 PHOTOGRAPHY EXPOSURE CALCULATOR
• Real-time EV Calculation: Computes EV100 automatically as light changes.
• Recommended Shutter Speed: Calculates exact camera shutter speeds based on your selected target Aperture (f/1.4 to f/11) and ISO (100 to 3200).
• Perfect for film photography, studio lighting, and spot metering.

📍 LOCATION RECORDING & SAVED READINGS
• Save light readings with custom spot names (e.g., "Living Room Desk", "Office Workstation", "Greenhouse", "Photo Studio").
• Includes quick location presets, timestamps, and custom notes.

📚 LIGHTING STANDARDS GUIDE
• Built-in reference table comparing current illuminance against ISO/EN standards for Home, Office, Workbench, Classrooms, Photo Studios, and Houseplants.

🎛️ INDEPENDENT CALIBRATION
• Fine-tune and calibrate front, rear, and camera readings independently against professional reference photometers.

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💡 POPULAR USES
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• Photography: Measure ambient and spot lighting for camera settings.
• Plants & Horticulture: Measure grow light levels (Lux/FC) for houseplants and succulents.
• Office & Home: Ensure recommended lighting levels for reading, study, and desk work.
• Energy Efficiency: Test LED light bulb output and fixtures around your home.

Download Lux Meter today for fast, accurate light measurement!