I tried it when I got my new light. Last summer. I thought the light looked crazy bright after calibrating, but I've never had a sensor before so thought maybe I might've always been too dim. Just checked now and it was only beta at the time, so might be much better nowI know back in the day the migro dude tested an apogee par meter against photone app and he said iphone was really close to the par meter…. Android he said it was total garbage and nowhere near accurate! This was a lil ways back tho!