Light, in real time.
Read lux or foot-candles, see exposure value at ISO 100, and understand your surroundings with a logarithmic gauge.
ILLUMINANCE · EXAMPLE
480lx
DarkIndoorSunlight
Everyday light, made understandable.MEET LUX LIGHT METER
See your light.Know your space.
Turn your Android phone into a light meter. Measure, understand, and record the light around you.
Your phone’s real light sensor
Offline. Private. No account.
Measure, save, and export
Built-in exposure toolsLight shapes your space.
Understand it. Make it yours.
More than a number.
A clearer picture.
From your first reading to your next decision, everything you need to make sense of light.
Catch the changes.
Follow a live chart over 30 to 300 seconds. Track minimum, maximum, and average. Hold a moment or reset for a fresh session.
−60 secondsNow
A memory for your measurements.
Save readings with notes and named locations. Revisit session charts, filter your history, and share individual records or everything as CSV.
EXAMPLE SAVED READING
Studio windowAfternoon · Sheer curtains closed480 lx
Studio windowAfternoon · Sheer curtains closed480 lx
Make it your meter.
Calibrate against a reference meter. Adjust smoothing, choose a theme, set threshold alerts, or keep the screen awake while measuring.
Reference calibration×1.20Example: 250 lx raw → 300 lx calibrated
FOUR WAYS TO SEE MOREOne app.
One app.
Every angle.
A focused meter up front. A world of useful detail just a tap away.
Everything in the light.
A large, clear reading. A gauge that spans dim rooms to daylight. Your session statistics and live chart, together in one place.
- Lux, foot-candles, and EV at ISO 100
- Hold, Reset, and Save always within reach
- Configurable smoothing and chart windows
01 / 04
GET A FEEL FOR LIGHTHow bright
How bright
is bright enough?
Move the slider or choose a scene. See how light levels translate into lux, foot-candles, and exposure value.
An interactive example, using simulated values. This website does not access your device’s light sensor. Reference ranges are indicative.
LIGHT EXPLOREROffice desklx
44.6 foot-candles+7.6 EV at ISO 100
0.1 lx100,000 lx
480 lx is within the typical 300–500 lx range for office screen work.
Find your kind of light.
A small tool for the spaces you live in, the things you grow, and the images you create.
Make your space
work better.
Compare your desk, kitchen, or reading corner with typical light levels. See what changes when you move a lamp.
A brighter spot
to grow.
Compare windows and shelves. Save readings by location to understand the light your plants receive.
Before the shot.
Know the light.
Calculate camera settings from live or manual readings, with compensation, ND filters, and video shutter angle.
Keep a
useful record.
Document readings with notes and locations. Export them for comparison, review, or a spreadsheet.
From a light reading
to your next frame.
The built-in exposure calculator solves shutter speed, aperture, or ISO from your live reading or a manual input.
EXAMPLE EXPOSURE · ISO 100
Measured light81,920 lx
Aperturef/16
Exposure value+15.0 EV
Nearest full-stop shutter1/125s
A practical starting point for your camera.
Full, half & third stopsExposure compensationND filters & custom stopsVideo frame rate & shutter angle
Incident-light calculations are based on the phone’s sensor. Camera-based reflective metering is not included.
Open. Measure. Make sense of it.
No setup ritual. No account. Just your phone and the light in front of you.
- 01
Let the light in.
Open Lux on a compatible Android device. Keep its ambient light sensor uncovered and face it toward the light.
- 02
Find your reading.
Let the value settle. Switch units, compare the guide, or tap Hold to freeze the display while you inspect it.
- 03
Keep what matters.
Save a reading with a note and location. Revisit its chart later, or export it as CSV when you need it.
Your light. Your data.
Lux works entirely offline. Measurements stay on your device and leave only when you choose to export them.
No accountsNo ads or analyticsNo cloud uploadsNo runtime permissionsA few things to know.
Clear answers, before you start measuring.
Which devices does Lux support?+
Live metering is designed for Android 7.0 and above on phones and tablets with an ambient light sensor. Sensor availability, range, and resolution vary by device. If no sensor is available, Lux explains the limitation; history, manual exposure calculations, and the reference guide remain usable.
How accurate are the readings?+
Phone light sensors are not calibrated instruments. Glass, sensor placement, and the light source all affect the result, so readings are indicative. The reference-meter wizard can help you calibrate against a dedicated meter. Use a professional calibrated instrument for certified or compliance measurements.
Does it use my camera?+
No. Lux measures incident light using the phone’s ambient light sensor. The exposure calculator uses that reading or a manual value; it does not provide camera-based reflective metering.
Can I use Lux on an iPhone?+
Live light metering is an Android feature. iOS does not expose a public ambient light sensor API, and an iOS product is outside the current release scope.
What can I save and export?+
Save the reading, session minimum, maximum, average, samples, and calibration factor, with an optional note and location. Each record includes up to one hour of session samples. Export a single record with its samples, or all saved records as a CSV summary through your phone’s share sheet.
Are the guide’s light levels recommendations?+
The guide provides typical, indicative ranges for home, work, public spaces, outdoor conditions, and plants. It marks your reading as below, within, or above each range. These ranges provide context and are not a substitute for a lighting design assessment or a plant-specific care guide.
Is the app available on Google Play?+
The Android app has been implemented and verified in the emulator. Release signing and the Play Store listing are the next steps. This showcase does not currently link to a public store release.
Good light starts
with knowing it.
Meet your everyday light companion.
Built for Android. Made to keep things simple.
Android app · Play Store release in preparation