First of all, how high do you have the lights mounted? For the typical tank that size (I am assuming it's basically a 15" cube), the lights should be mounted about 9" above the water level for best, most even spread.
Second, what are you trying to grow? There's a pretty big difference in PAR requirements for softies/LPS and SPS, so the peak intensities will vary.
The cool thing about the myAI app is that it tells you the wattage the light will be using at the different timepoints along the schedule (move to a time point, click "edit" and then it should show the wattage used at that point). It's not foolproof, but you can get very close to the intensity you need based on the wattage, as long as your mounting height is appropriate.
You can adjust the intensity of all the points at once by putting 2 fingers on the graph in myAI and sliding the whole thing up or down. Use your 12:30pm scheduled point as a reference, since it looks to be the peak of the entire schedule.
Slide the graph up or down until that point hits 15-16 watts total if you're doing softies and LPS. If it's an SPS tank, you'll need to be around 34-35 watts... assuming the 9" mounting height, of course. If you're running a mixed reef with some of everything, it's harder to guess, but I'd suggest starting closer to the LPS settings and then working your way up from there.
If you decide you want to use a different schedule, you can adjust it the same way. Like I said, it's not a replacement for getting your hands on an actual PAR meter, but it's a reliable way to get yourself in the ballpark and make sure you're not grossly under or over lighting your tank.
