Lux Light Meter Photometer PRO

In-app purchases
4.0
3.16K reviews
500K+
Downloads
Content rating
Everyone
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About this app

We all want more light in our lives. But how much is too much? And how much is not enough? That's where Photometer PRO comes in.

Our lux light measure app - Photometer PRO - helps you measure the brightness of your environment so that you can get the right amount of light for every situation.

👉 WHO CAN BENEFIT from our lux light measure app?

Whether you're a construction worker trying to compare different light levels after switching out your Halogen bulbs for LEDs, or just a flower hobbyist who wants to make sure each of your plants gets exactly the right amount of light, our lux light measure app - Photometer PRO - has got you covered. It even helps biology teachers practice photosynthesis!

✅INCREASE YOUR PRODUCTIVITY: whether you are a lighting designer, architect, electrician or just working from your home office - you can use the app to measure light levels and optimize lighting conditions, increasing productivity and enhancing the visual appeal of your projects

✅IMPROVE YOUR PLANT'S GROWTH: whether you are a horticulturist, greenhouse owner, or just a millennial (as we are!) who loves a little jungle in your home - you can use the app's PPFD calculator to determine the optimal light levels for plant growth, helping them create ideal growing conditions

✅SAVE THE ENERGY: our lux light measure app - Photometer PRO - helps homeowners, business owners, and lighting professionals select the right light bulbs and lighting fixtures, reducing energy consumption and promoting sustainable living

✅IMPROVE YOUR HEALTH: proper exposure to bright light, cool light, or a specific lighting schedule can significantly reduce the perception of stress and burnout. Light also plays a key role in setting and regulating the body’s biological clock (hormone function, like melatonin)

👉 FEATURES

With high-accuracy light measurement, you can be sure that your readings are as precise as possible. You can even export all your measurements to a CSV file and work with the data like a professional. Plus, the app offers many functionalities, including Lux and Foot-candle units, Full light sensor information & calibration, PPFD Calculator, a Greenhouse module, a Photovoltaics module, and more.

✅ High-accuracy light measurement
✅ Export all measurements (lx, fx, W/m2) to a CSV
✅ Lux and Foot-candle units
✅ Measures & record minimum, average and maximum brightness possible
✅ Full light sensor information & calibration
✅ Measure indoors & outdoors
✅ Compare the room’s brightness level
✅ Light meter to do experiments
✅ Test flashlights and other light equipment
✅ Setup projector screen

✨MODULES✨

🔸LIGHT MAP - make a light map of your interior and check if your home is adequately lit

🔸PHOTOVOLTAICS - measure light volume, record and create a real-time light volume graph to improve your electricity production

🔸PHOTOGRAPHY - measure exposure, lux/foot-candle, f-number, and shutter speed as well as ISO sensitivity

🔸PHOTOGRAPHY CAMERA- works similar to photography module but uses you front/back camera to calulate values instead of light sensor

🔸GREENHOUSE - measure and calculate supplemental light in your greenhouse or indoors with many light sources option

🔸AQUARIUM - measure the adequate amount of light needed in your aquarium for plants, based on their type and size

🔸RGB - measure color temperature (R, G, B) and the amount of lux using a camera in your smartphone

✨CALCULATORS✨ you can find in our lux light measure app include among others

✅ PPFD & Greenhouse lighting
✅ Lux ⇌ Lumen
✅ Lux ⇌ Candela

✨Other benefits✨

✅ Support many languages
✅ Smart, minimalistic, simple, and intuitive user interface
✅ Dark Mode
✅ Instant start & excellent performance
✅ Insights & Knowledge base
✅ Ready for professional & productive usage
✅ A closed beta group for PRO users

💡 Photometer PRO is a project with a bold vision: Provide free and open access to light measurements and knowledge to everyone worldwide.

More: https://photometer.pro/
Updated on
Dec 2, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
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Ratings and reviews

4.0
3.12K reviews
Scott Livingston
October 28, 2022
Cool app. I use it for general light level comparison, not photography. Mostly to match various cheap "smart" bulb outputs around the house. It would be very nice to see Lumen added to the meter options rather than using the Calculator in the Pro version. As I move from a Pixel 4XL to a 7 Pro I noticed the readings are quite different. I need to look to see if there's some sort of calibration I need to do.
230 people found this review helpful
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Jamie Hall
December 17, 2020
This is a good little app, best news is you can download and try it cos it's free! Unfortunately it's defaulted to my selfie camera and not my main (Pixel 3) and I can't figure out how to change that (might be 'my bad'). I think it's ripe for more development, such as using the camera zoom function to create more of a spot meter, which I understand should be possible. I'll be keeping this on my phone for photovoltaic purposes for now...a bit of photography. Good effort, look forward to updates.
36 people found this review helpful
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Przemek Pardel
December 17, 2020
Hi Jamie. I have all Pixel generation at home. Already using Pixel 4 😁I'm using device sensor located nearby selfie camera. On the Pixel phone you have only one sensor. I don't even know device with two light sensors to be honest. So I can't use different one. Good news for you. I'm already working on module dedicated for photography. Stay tuned😁
Luke
September 20, 2025
good app, would give a 5 if the widget offers better contrast. really hard to see the text even with the different backgrounds. does not meet accessibility requirements for reading the widget text (the main number). will update review if this is addressed later.
3 people found this review helpful
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What’s new

- New pro module custom light tool
- Bug fixes
- Code improvement