I absolutely agree with you. In refrigeration manufacturing they commonly test the cases at dozens of places in the unit. They also do these tests at varying levels of content (full shelves, empty shelves). One thing that we’ve yet to even mention is how much as the plants grow that will change the unit. In the very beginning, when the plants are tiny much of the light will be hitting the top of a reservoir (if your reservoir is black, this can really make an impact). As your plants grow, much of that energy that then turns into heat is later blocked by the canopy of your plant. I definitely think there is a huge amount we can learn by comparing the differences inside of a grow box.
@wsnook cool graph btw. Curiosity, why do you think there was a dip midday?