So I did a thing and bought a Apogee Quantum PAR meter. I did a comparison this morning between the Photone app on my phone and my new meter. The first tested was a PAR reading on the MH bulb I have in the veg tent. Surprisingly close with only a few PAR difference between the two. Next test was on my full spectrum HLG Scorpion hanging in the flower room. The phone app is reading over 200 PAR higher than the Apogee. So my conclusion is that the Photone app works well if running HID’s. Not so much so if running LED. Just thought I’d pass my observation along for what it is worth.