The shell calibration is convenient because it calibrates all pixels at once. We have to make sure that having light from all directions at once does not diminish the quality of each pixel's calibration. A good test may be to mount a cone in front of an individual pixel, so light getting to that pixel can only come from the circle on the mirror which should be illuminated by light coming through the diaphragm in its cone of directions. Check pixels at the mirror center, at the corners, at the edges, etc. Absolute calibration using nearby laser shots of known energy.
Stars Compare current monitor to fluctuation measurements.
Measure spot shape via pixel transitions. Trigger and reconstruction tests with the vertical flasher events. Trigger sensitivity as function of distance and angle. Plane reconstruction accuracy vs. tracklength and amplitude. Monocular reconstruction accuracy.