Lux Meter - Light Exposure Calculator
Achieve perfect exposure every time with professional-grade accuracy and intuitive design. Trusted by photographers, filmmakers, plant enthusiasts, and lighting professionals worldwide
Turn your smartphone into a professional light meter with our precise Lux Meter app. Achieve perfect exposure every time with professional-grade accuracy and an intuitive design. Trusted by photographers, filmmakers, plant enthusiasts, and lighting professionals worldwide.
Why Choose Our Lux Meter?
Professional Accuracy
Pre-calibrated to match three professional light meters, with users regularly confirming accuracy against expensive equipment.
Easy to Use
Intuitive interface praised by users as simple and practical - perfect for both beginners and professionals.
Superior Low-Light Performance
Unlike other smartphone light meters that fail in low light, our Lux Meter excels in very low light conditions, even when measuring with the cameras. Measures below 1 lux, 0.1 fc, and nearly down to -2 EV, making it reliable for both indoor and outdoor photography.
Excellent Value
Professional-grade functionality at a fraction of the cost of dedicated light meters.
Trusted by Professionals
Used by photographers worldwide who have compared it against professional equipment and found it to be remarkably accurate and reliable for their daily work.
Usages
Photography - Manual Exposure Control
Essential for photographers using manual mode on DSLRs, mirrorless cameras, or film cameras. Get precise exposure readings and instantly see the perfect combination of aperture, shutter speed, and ISO for your shot. Ideal for shooting with vintage cameras that lack built-in light meters.
Cinematography & Video Production
Ideal for filmmakers who need consistent exposure across scenes. Use shutter angle mode for cinema cameras, measure key light and fill light ratios, and ensure proper exposure for video work. The continuous readings help maintain consistent lighting throughout your shoot.
Indoor Plant Care
Ensure your houseplants get enough light for healthy growth. Different plants require different light levels - measure the actual light intensity at plant locations to verify they're getting adequate illumination.
Workplace & Home Lighting Assessment
Check if your workspace meets recommended lighting standards. Office work typically requires 300-500 lux, while detailed tasks may need 500-1000 lux. Verify that lighting conditions are adequate for reading, computer work, or other activities that require good visibility.
Art & Museum Lighting
Verify that artwork and exhibits are properly lit according to conservation standards. Different materials require different light levels to prevent damage while ensuring visibility.
Aquarium & Terrarium Lighting
Measure light intensity for aquatic plants and reptiles that have specific lighting requirements. Ensure your lighting setup provides adequate illumination at substrate level, not just at the top of the tank.
Educational Demonstrations
Teach photography students about the relationship between light intensity and exposure settings. Demonstrate how aperture, shutter speed, and ISO work together. Show the inverse square law by measuring how light intensity decreases with distance from the source.
Quality Control & Compliance
Verify that workspaces meet lighting standards and regulations. Document lighting conditions for safety inspections or compliance reports. Ensure consistent lighting in manufacturing environments where visual inspection is critical.
Key Features
📊 Interactive Exposure Calculator
Get instant, optimal camera settings with real-time adjustments for aperture (f-stop, f-number), shutter speed (exposure time), ISO, +/- exposure compensation, and filters. Lock any setting to keep it fixed while the app automatically adjusts the other settings as lighting changes. Perfect for SLR, analog, manual, vintage, and film cameras.
⚙️ Adjustable Step Sizes for Precision
Choose between full stops, half stops, and third stops individually for each parameter (aperture, shutter speed, and ISO). This flexibility lets you work with your preferred level of precision and matches your camera's capabilities.
🎬 Shutter Angle for Video & Film
Set your frame rate and shutter angle, or use the standard 180° rule, to automatically calculate the optimal shutter speed for natural motion blur. The app supports cinema-style shutter angle measurements from 11.25° to 360° with common presets like 180° (natural motion), 90° (crisp motion), and specialized sync angles for flicker management. Works with comprehensive FPS presets including 23.98, 24, 25, 29.97, 30, 48, 50, 60, 120, 240 fps and more.
🎯 Dual Measurement Modes
Incident measurement using your device's light sensor (Android only) and reflective measurement with the rear/front cameras. Resizable measurement area with spot metering for precise control - adjust the size of the measurement zone using on-screen arrows to focus on specific areas.
📷 Multiple Camera Support
Switch between front and back cameras (and any additional cameras on your device) for maximum flexibility. Each camera has its own independent calibration, so you can optimize accuracy for whichever camera you prefer to use.
✨ Comprehensive Filter Support
Support for ND (neutral density) filters, color filters, IR filters, CPL/PL polarizing filters, and custom filters with precise compensation. Adjust exposure compensation directly in the exposure picker for scenarios requiring intentional over or under-exposure. Perfect for creative photography and complex lighting setups.
📏 Multiple Units with Visual Gauge
Measure in Lux (lx), Foot-Candles (fc), and Exposure Value (EV) with instant switching between units. The large visual gauge provides an intuitive representation of light levels with both numeric values and calibrated markings. Toggle symbol display mode to see lighting condition icons (nighttime, indoor, outdoor, bright sun, etc.).
💾 Save and Reference Measurements
Store unlimited readings with timestamps, notes, and complete camera settings for future reference. Build a comprehensive library of lighting setups and conditions. Compare current measurements to saved ones to recreate consistent lighting across sessions.
🔄 Calibrated and Uncalibrated Values
The app displays both calibrated and uncalibrated measurements side by side, so you can see the raw sensor data and the calibrated result. This transparency helps you understand your device's performance and verify calibration effectiveness.
⏱️ Real-Time Continuous Measurement
Continuous readings update in real-time as lighting conditions change, perfect for dynamic shooting environments.
🎯 Good Accuracy Out of the Box
Pre-calibrated to match three industry-standard light meters right out of the box. Users regularly confirm accuracy against expensive professional equipment. For most users, no additional calibration is needed.
🔧 Optional Advanced Calibration
While the app works great uncalibrated on most devices, you can optionally perform advanced calibration for maximum accuracy. Each camera and the light sensor (if existing) has its own independent calibration, allowing you to fine-tune each sensor separately for the best possible results.
🌙 Superior Low-Light Performance
Unlike other smartphone light meters, this app excels in very low light conditions, even when measuring with the cameras (reflective mode). Measures values below 1 lux, 0.1 fc, and nearly down to -2 EV. Reliable measurements in challenging lighting conditions where other light meter apps fail - essential for indoor photography, night photography, and any low-light situation.
What Users are Saying in Official Reviews
"It feels like super powers! It's amazing to be able to squeeze out all the juice there is in my phone's sensors."
"I've checked this light meter against my Seconic L308, all readings are spot on aperture shutter speed and ISO. Well worth the small cost, I would highly recommend."
"Great surprise what the app offers. I got excited to practice photography!"
"Perfect exposures so far, probably the best light meter app on the play store"
"Excellent application, very fast and intuitive and complete"
"Very effective. I checked with a professional device and the same results"
"Have tested this against my Canon EOS R10. With the lens RF 24-240mm f4. It gives me a good explanation of what I should set the camera to, instead of poking around."
"Works very well, I'm delighted for outdoor exposure and for measuring studio light"
"Perfect for me. Very accurate and I absolutely love that I get aperture and shutter speed values at any ISO I choose for a given Lux value."
"This is a very handy app for photographers who use manual mode in their cameras. The interface is very intuitive and allows for full control. I highly recommend it."
"Extremely accurate and easy to use. The incident light metering is spot on, and the custom exposure curves are a game-changer for reflected light readings. Easily a 5-star app!"
Need Help or Have Ideas?
We're committed to making this app the best it can be. Your feedback matters to us, and we personally respond to every user who contacts us. Whether you have questions, need support, or have ideas for new features, please reach out to us at [email protected]
Wide Language Support
The app has full support for 40 different languages, making measurement accessible worldwide.
Download the Lux Meter app now
All the basic functionality of the app is free. To use the more advanced features a subscription or a one time fee is required.