Yeah i'm old school, dont have the energy to track it via another ipad and scribble when my hand's wet, and i can clean it easily with the blade afterward.
most readings are dead center at the cross point.
those readings are what I currently run, no changes planed for my light intensity, and i don't ramp up or down, my lights stay at the same intensity for 8hrs daily, and controled by wifi plugs.
as for my frag tank, i run full blue when i'm introducing new fishes ( after qt ) and new corals, especially those high end zoas.