Photone app

Iam using it too but on iPhone. You need a piece of paper on top of the sensor for readings ,works well for me as a hobby grower, this app is good unless you wanna spend $$$ on high end reading products . Also experts on here described it more :) .

Thanks Ezzjaybruh, My main thing is every camera is different in every model made, I think only the new ones would be good at it as they have a greater digital range of detecting colours and brightness based on aperture and ISO. in short, the older the phone, the more unreliable it will be. If you have a newer phone, use it. it will be pretty close to what you need.

Mouse makes valid points, BUT Apps are developed for each possible operating system and hardware. It’s not the same math or algorithm or whatever used for a iPhone 6 compared to an iPhone 11.. they account for that in app development. It’s a damn good alternative if you don’t wanna spend a lot of money on a more accurate one.

I use it consistently. You gotta pit a piece of paper on top of the sensor up top. At least that’s what I’m supposed to do on the iOS version. I love it. Shane from migro showed it against an apogee sq500 and it’s within 10% variation which is amazing for a in app purchase. I don’t believe there’s any calibration necessary- at least not on the iOS version. Only a sheet of paper across the front facing camera.

after a quick google it seems that the android version of the app is not accurate but the IOS version was more consistent and only off by about 10% vs a calibrated light meter. But I'd take that review with a grain of salt. Way to many variables. In short phones are not designed to be light meters. Plus not all iPhone's can be within the same accuracy range, they all have different cameras and apertures. combined with how many models there are and light setups and spectrum's, I feel its a use it if that's all you got option. I'd say use it as a ruff ballpark range for your readout and adjust accordingly if its the IOS version on a newer model of iPhone. Might need to borrow a friends phone. There are also light meters that connect to your phones ports. They would be a good options as well. Best of luck