With regards to the Seneye - get some help if that is the tool you are going to use to take measurements. It isn't a bad unit but a bit cumbersome to use on your own while taking snapshots. It had a top, middle, and bottom button already and when clicked has a timer which counts down from 5. It would be nice if that was adjustable. It would also be nice if the free form option had a bigger take measurement button

In fact, I wish it had a record feature rather than snapshot.
Anyway it is a nice tool to maybe help tune in custom lights if one knows what to flip for a more proper setting. I recently picked up one and have been toying with it here and there. I'm seeing anywhere from 540 par at the top with 170 at the bottom. Middle is ranging from 330 to as low as 70 in the center where I have no lights (working on that at the moment). So it does take good measurements but I believe another person to click measurement with text would make it 10x easier.
This reading here below is 330 par left side of my tank middle with chips running at 80%. I'm going to assume the front think black line in bold is how the Seneye unit seems my lights and is overlaying or comparing it to something else. Not sure if I'm supposed to say oh - need to change this or wow, not so bad after all. If left side of graph purple 400 to 550 is good and the red readings of 600+ is bad

Anyway it is a good tool. I saw some comments here so wanted to suggest help