I calibrated it with a UNI-T UT383BT lux meter and after setting to a 1.2x calibration it was surprisingly accurate. This was on a Google 6 Pro, so when I went from very low light to sticking it under a bright light this app was always within 5%, pretty good, 5⭐⭐⭐⭐⭐ from me. So if you have a pixel 6 or 6 Pro, go to calibrate and move the slider to 1.2x, that's it you have a free lux meter app that can compare to a proper lux meter.

This app is very beneficial for determining how much LUX I'm getting in my eyes from sunlight exposure at various times of day, and how much I'm being exposed to by artifical lights at various times of night! And, to top if off, it's free! I definitely suggest downloading this app! It's fun to find out the specific amount of LUX you're receiving, and can be an incredibly potent health mechanistic factor.

Very easy to use. You can store and add a note for each measurement, feature that I really liked. I'm using to record light exposure and adjust the circadian rhythm.

Love the app. Haven't had any issues with it yet. Update - I compared the readings on the app to that on a dedicated light meter, and got the same results, which is quite reassuring.

very useful for selecting indoor plants to required lighting levels. Update: Just tried before & after replacing 4 ft, fluorescent T12 bulbs with T8 LED bulbs. LUX went from 515 to 930. Used the extremely useful 'Store & Recall' feature (stores average).

I just found out about this light energy measurement thing, and I'm amazed by how little light gets in my room. The app seems to work great, just be sure to measure in different conditions to make sure that it works properly.

Fantastic Very easy and fast response. No lagging. This would have been excellent if light Temp in K would also been shown... When Lux and Kelvin combined they provide the best environment details. Thumbs up to the creator.

Very useful app. Seems quite accurate vs. a dedicated meter under florescent light. Strangely seems a little less so with natural light.

Works! I Don't have anything to compare for accuracy. However it gives you a good idea of where your at as far a lux and light temp.

Does what it says on the tin. Uses the phone's lux meter and not its cameras, so it's accurate to as much as the camera's sensors are accurate.

Easy to use. No phone issues. Highly recommend it. On average I start 200 seedlings per year, mostly tropical Milkweed so knowing my light output is necessary, this little gem does the trick

Works great, my only change would be to mention clearly on app start that it doesn't use phone cameras, and that it uses the phone's hardware light sensor. That's I'm the readme, which is easily accessible, but there's no prompt to read it :) I used this to get an average of the brightness in my home office. This let me set the screen brightness to match, which is helping me reduce eye strain.

Wow! I have no idea what the spectral response of the light sensor in my Galaxy Note 9 is, but I needed a quick light meter to find out what the effect would be of replacing my fluorescent fixtures with LED fixtures in my kitchen. This was quick, the perfect answer for me, and very complete in that it shows averages, min/max and lets me record past readings. It is also ideal for helping me plan the placement of the new lights. A huge thank you for developing this handy app.

I don't give 5-Star reviews unless the app, the service, or the product is truly exceptional. Lux is one example. Near perfect user interface, it simultaneously reports min, max, and average light levels in Footcandles or Lux (1 Fc/M^2) and is easily calibrated if you have access to a reference light source. Most homes have very poor lighting designs, Lux let's you quantify the problem, and with that, creating a solution is much easier.

Does exactly what it says. Could be nicer with a graph that let you know moving averages & max/min values over selected ranges within the graph, and maybe even a temperature graph overlay to make it easy to troubleshoot growing conditions for sensitive plants like orchids. However as a basic tool, this app is very straightforward & useful. Thanks for writing it!

Does what is supposed to do in the measurement of light intensity, got another meter, both are very similar in measurement! Reason for 4 stars, might be doing something wrong, but under light source, numbers in constant flux, in other words constantly show too many and very fast light variables , so can be confusing in any particular amounts. If you want a generalization it a great app!!

It does exactly what you'd expect with non-intrusive ads. The reset button is easy to hit and the average gives you a more accurate reading.

Seems to work great! While I have no other measure of the light, placing plants in areas based on this reading has helped them thrive.

Great, except I haven't found a way to store the average and max light levels for each entry.

The app uses the front camera to capture the background light. But it's a simple design that delivers exactly as promised.

The app is simple to use and appears to work very well in most normal lighting condtions but does not show low level lighting to decimal places, ie Nighttime Street lighting.

Very simple app and that's a good thing. I have a light meter gadget and this app was within 5% of that, which is really good for something that should be used as a rudimentary tool to give you a general idea of the lighting intensity of a particular space/light source. The only improvement I would suggest is to make it clear that it isn't using the phone's camera and to try to move the phone around for to determine where your light sensor is.

Don't know how precise it is to a standard, but very helpful for position plants in grow tent. Easy to ID dark spots. Useful.

Read the app instructions to be sure you are using it correctly! The app seems to work very well and is easy to use. I like being able to store values. I'm using the app on Samsung Galaxy S9.

App uses front facing camera! Actual measurements probably aren't accurate but is very helpful in comparing lighting around the house.

Ummh I give it 3 stars bc for my friends the app is working fine... But for me it just doesn't work... The lux number doesn't change... Maybe someone can help with this issue? :(

Excellent app, I recommend this app to anybody that needs a Lux meter. Or to work out PAR of light Lux to par isn't exact but close close enough.

Doesn't work. Still has ads. No response to emails to the author. Don't know how to get money back for this useless app.