Light Meter - Lux, Exposure

Precise Light Meter with Built-In Exposure Calculator

Achieve perfect exposure every time with professional-grade accuracy and an intuitive design. Trusted by photographers, filmmakers, plant enthusiasts, and lighting professionals worldwide.

📷 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.

Choose between full stops, half stops, and third stops individually for each parameter. Lock any setting to maintain creative control. Perfect for SLR, analog, manual, vintage, and film cameras.

🎬 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.

🎯 PROFESSIONAL ACCURACY

Pre-calibrated to match three professional light meters, with optional device-specific calibration for even greater precision.

📐 DUAL MEASUREMENT MODES

Incident measurement using your device's light sensor and reflective measurement with the rear/front cameras. Resizable measurement area with spot metering for precise control.

🌙 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.

🟢 COMPREHENSIVE FILTER SUPPORT

Full support for ND (neutral density) filters, color filters, IR filters, CPL/PL polarizing filters, and custom filters.

💡 MULTIPLE MEASUREMENT UNITS

Measure light intensity (illumination/brightness) in Lux (lx, lumens/m²), Foot-Candles (fc), and Exposure Value (EV).

💾 SAVE MEASUREMENTS

Store unlimited readings with timestamps, custom notes, and complete camera settings for future reference and comparison.

🌟 VERSATILE APPLICATIONS

Beyond photography and filmmaking, widely used for horticulture 🌱, plant growing 🪴, aquariums 🐠, terrariums 🦎, art galleries 🖼️, museums 🏛️, offices 🏢, and workspaces 💼.

🕯️ ALL LIGHT SOURCE TYPES

Accurately measures LEDs, incandescent bulbs, fluorescent lights, halogen lamps, natural sunlight, laser diodes, OLEDs, and any other artificial or ambient lighting.

🇬🇧 40 LANGUAGES SUPPORTED

Fully localized interface and comprehensive user documentation in 40 languages, including English.

⚙️ FULLY CUSTOMIZABLE

Tailor the app to your workflow, including high-contrast mode for accessibility.

✉️ RESPONSIVE DEVELOPER SUPPORT

Questions or feature requests? Email [email protected] — you'll get a personal response!

Turn your phone into a professional light meter today!